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Worksheets

Science mid term

Total questions: 150

Worksheet time: 2hrs 49mins

Name
Class
Date
1.

Which of the following statements about freezing as a method of food preservation is INCORRECT?

a)

It helps to slow down the growth of food spoiling bacteria.

b)

It kills the bacteria present in the food.

c)

It helps to slow down the enzyme activity of food spoiling bacteria

d)

The water inside the food freezes into ice crystals

2.

What food preservation technique has been used here?

a)

Freezing.

b)

Drying.

c)

Salting.

3.

Assertion: Pasteurisation is the method to preserve milk.

Reason: In pasteurisation, the milk is heated to high temperature and cool down slowly.

a)

Both A and R are true and R is the correct explanation of A.

b)

Both A and R are true but R is not the correct explanation of A.

c)

A is true but R is false. A is false but R is true.

d)

Both A and R are false.

4.

Assertion: Adding salt preserves the meat and fish for ages.

Reason: Salt draws water out of food and dehydrates the food.

a)

Both A and R are true and R is the correct explanation of A.

b)

Both A and R are true but R is not the correct explanation of A.

c)

A is true but R is false. A is false but R is true.

d)

Both A and R are false.

5.

Which of the following is considered a physical property of an element?

a)

density

b)

color

c)

conductivity

d)

flammable

6.

Malleability is a physical property. It means . . .

a)

a solid element can be crushed into a powder.

b)

a solid piece of metal can be hammered into a shape.

c)

a solid piece of metal can be pulled into a wire.

d)

a solid can be melted to a liquid.

7.
Which of the following is a property of a non-metal?
a)
Conducts electricity and heats well
b)
Can be hammered into thin sheets
c)
Is brittle and breaks easily
d)
Has a shiny, metallic luster
8.

Assertion: Mercury is widely used in clinical thermometer.

Reason: Mercury is solid at room temperature.

a)

Both A and R are true and R is the correct explanation of A.

b)

Both A and R are true but R is not the correct explanation of A.

c)

A is true but R is false. A is false but R is true.

d)

Both A and R are false.

9.

Assertion: Copper used widely to conduct electricity.

Reason: Silver has the highest electrical conductivity of all metals.

a)

Both A and R are true and R is the correct explanation of A.

b)

Both A and R are true but R is not the correct explanation of A.

c)

A is true but R is false. A is false but R is true.

d)

Both A and R are false.

10.

Question 2: Cold, influenza and most cough are caused by ___?

a)

Bacteria

b)

Viruses

c)

Fungi

d)

None of these

11.

Question 3: Antibiotics

a)

kill disease-causing microorganisms

b)

slow down the growth of disease-causing microorganisms

c)

convert sugar into alcohol

d)

speed up the growth of micoorganisms

12.

Question 7: Which of the following statements are True/False? (A) Boiling kills many organisms. (B) Low temperature inhibits the growth of microbes.

a)

Only A

b)

Only B

c)

Both A and B

d)

None of these

13.

Question 8: Conversion of nitrogen to ammonia is

a)

nitrification

b)

phosphorylation

c)

denitrification

d)

nitrogen fixation

14.

Question 12: Which of the following is a non-communicable disease?

a)

Tuberculosis

b)

Chicken pox

c)

Diabetes

d)

Common cold

15.

Bacteria is known as__________________ in an ecosystem when feeding on dead organisms.

a)

Decomposers

b)

Herbivore

c)

Pathogens

d)

Infections

16.

The existence of diverse variety of plants and animals living in region is called........................

a)

Species

b)

Flora

c)

Fauna

d)

Biodiversity

17.

Oil spill is a threat to organisms living in ..........................

a)

Forests

b)

Deserts

c)

Seas

d)

Plains

18.

Relationship between a biotic community and an abiotic environment is called...............

a)

Biodiversity

b)

Ecosystem

c)

Symbiosis

d)

Survival

19.

Loss of biodiversity is also because of ................ in human population.

a)

Increase

b)

Decrease

c)

Spread

d)

Fight

20.

All the different kind of plants living in their natural surroundings are called the .........of that place

a)

Flora

b)

Fauna

c)

Both of these

d)

None of these

21.

All the different kinds of animals living in their natural surroundings are called ..........of that place.

a)

Fauna

b)

Flora

c)

Both of these

d)

None of these

22.

Arctic tern migrate from Arctic region to...................

a)

America

b)

India

c)

Europe

d)

Antactica

23.

Illegal hunting of wild animals for commercial uses is called

a)

Pollution

b)

Conservation

c)

Poaching

d)

None of these

24.

DESERT PLANTS ALSO KNOWN AS

a)

DES. PLANTS

b)

XEROPHYTE

c)

PLANTS IN DESERT

d)

DESERTIC PLANTS

25.

THE PROCESS BY WHICH AN AREA GETS CONVERTED INTO A DESERT IS KNOWN AS

a)

ENDEMIC

b)

DESERTIFICATION

c)

DESERT

d)

ALL OF THEM

26.

Domestic consequences of deforestation are-

a)

Flooding

b)

Draught

c)

Soil erosion

d)

All of these

27.

Reforestation cannot take place naturally.

a)

True

b)

False

28.

What are the large areas of protected land for conservation of wild life, plant and animal resources and traditional life of the tribals living in the area?

a)

Biosphere reserve

b)

National Park

c)

Sanctuary

29.

Oil spill is a threat to organisms living in ________.

a)

Forests

b)

Deserts

c)

Seas

d)

Plains

30.

Purposes that trees are cut for:

a)

Producing land for cultivation

b)

Building houses and factories

c)

For fun

d)

Because they need a lot of water

31.

Can Global Warming occur due to deforestation?

a)

No, because the level of oxygen will be high

b)

Yes, as the carbon dioxide level will be low

c)

No, I don't know what Global Warming is

d)

Yes, as it will increase the amount of carbon dioxide in the atmosphere

32.
What is the equation used to calculate pressure?
a)
pressure= force/mass
b)
pressure =mass/volume
c)
pressure=area/force
d)
pressure=force/area
33.
Fluids can also include__ and__. 
a)
solids and liquids
b)
solids and gases
c)
liquids and gases
d)
liquids
34.
What is the unit of measurement for pressure?
a)
pascal
b)
grams
c)
milliters
d)
meters
35.
Which of the statements is true?
a)
The bottom of the boot exerts more pressure than the shoe as a result of an increase in surface area.
b)
The bottom of the shoe exerts more pressure than the boot as a result of an decrease in surface area.
c)
The bottom of the shoe exerts the same pressure as the bottom of the boot.
36.
If the horse reared up on 2 legs what effect would it have on the pressure?
a)
it will exert half the pressure it did before
b)
it will exert the same pressure it did before
c)
it will exert twice the pressure it did before
d)
it will exert four times the pressure it did before
37.
Army tank tracks are useful for travelling through the mud because..
a)
they decrease the force the vehicle exerts on the ground
b)
they increase the force the vehicle exerts on the ground
c)
they decrease the pressure the vehicle exerts on the ground
d)
they increase the pressure the vehicle exerts on the ground
38.
Which of these animals would probably cause the greatest pressure on the ground?
a)
A fat cow with big feet
b)
A fat cow with small feet
c)
 A calf with big feet
d)
A calf with small feet
39.
Pressure can be measured in Pascales (Pa) or Newtons per square metre.
1 Pa = 1N/m2
a)
True
b)
False
40.
What is a force that works AGAINST MOTION?
a)
Force
b)
Motion
c)
Gravity
d)
Friction
41.

Students roll toy cars down the same ramp with different coverings like carpet, foil, and sandpaper. What are they trying to test?

a)

How does the height of a ramp affect the distance a car will roll?

b)

How does the mass of the car affect the distance a car will roll?

c)

How does the surface of a ramp affect how fast a car will travel?

d)

How does the surface of a ramp affect the distance a car will roll?

42.

Two boys A and B are applying force on a block. If the block moves towards the boy A, which one of the following statements is correct?

a)

Magnitude of force applied by A is greater than that of B.

b)

Magnitude of force applied by A is smaller than that of B.

c)

Net force on the block is towards B.

d)

Magnitude of force applied by A is equal to that of B.

43.

Which of the following is proper example(s) to explain that force on an object may change its shape

a)

A ball of dough rolled into chapati

b)

Pressing a plastic ball kept on table

c)

Making model using clay

d)

All of the above

44.

Watch the green man skating. Choose all options that are correct.

a)

Both Contact and Non-Contact forces acting here.

b)

Non-Contact force is only acting here.

c)

Rolling Friction and Gravitational Force are present.

d)

Sliding Friction and Gravitational Force are present.

45.

A rocket has been fired upwards to launch a satellite in its Orbit name the forces acting downwards on the rocket immediately after leaving the launching pad

a)

Propelling force of gases emitted by combustion of fuel

b)

magnetic force of Earth

c)

gravitational force of Earth

d)

no force acting downwards

46.

Which of the following is not an example of muscular force

a)

A child riding a bicycle

b)

a person drawing water from a well

c)

a Porter carrying a load on a cart

d)

an apple falling from a tree

47.
Calculate the net force of the object.
a)
10N
b)
2N
c)
15N
d)
5N
48.

If a car at rest accelerates uniformly to a speed of 144 km/h in 20 sec., it covers a distance of:

a)

20 cm

b)

400 m

c)

1440 cm

d)

2980 cm

49.
Which of these animals would probably cause the greatest pressure on the ground?
a)
A fat cow with big feet
b)
A fat cow with small feet
c)
 A calf with big feet
d)
A calf with small feet
50.

Friction is a

a)

non - contact force

b)

contact force

c)

electrostatic force

d)

magnetic force

51.

In the figure a boy is seen pushing a box from right to left. The force of friction will act on the box

a)

from right to left

b)

from left to right

c)

vertically downwards

d)

vertically upwards

52.

In a large commercial complex, there are four ways to reach the main road. One of the paths has loose soil, the second is laid with polished marble, the third is laid with bricks and the fourth has a gravel surface. It is raining heavily and Paheli wishes to reach the main road. The path on which she is least likely to slip is

a)

polished marble

b)

bricks

c)

gravel

d)

loose soil

53.

Two blocks of iron of different masses are kept on a cemented floor. Which one of them would require a larger force to move it from the rest position?

a)

both requires same force

b)

box A

c)

box B

54.

Which of the following statements is true?

a)

Friction pulls objects towards the centre of the earth

b)

Friction primarily affects the objects that contain iron

c)

Friction slows down or stops objects in motion

d)

Friction does not affect objects in motion

55.

The direction of force of friction is always _____ to the direction of motion

a)

same

b)

opposite

c)

unchanged

d)

none of these

56.

Frictional force depends on ____

a)

surface area in contact

b)

roughness of surface

c)

both a and b

d)

none of the above

57.

Which of these materials do you predict would have the MOST amount of friction?

a)

metal

b)

tile

c)

sand paper

d)

denim

58.

When we rub our hands together _________.

a)

frictional force works between them

b)

energy is released

c)

our hands become warm

d)

all off the above

59.

The amount of friction depends on the weight of the objects

a)

True

b)

False

60.

Which of the following produces least friction?

a)

(a) Sliding friction

b)

(b) Rolling friction

c)

(c) Composite friction

d)

(d) Static friction

61.

Friction always

a)

(a) opposes the motion

b)

(b) helps the motion

c)

(c) both (a) and (b)

d)

(d) none of these

62.

The shape of an aeroplane is like a

a)

(a) dog

b)

(b) bird

c)

(c) car

d)

(d) all of these

63.

Friction due to fluids is called

a)

(a) force

b)

(b) pressure

c)

(c) friction

d)

(d) drag

64.

It is difficult to walk on an oily floor because

a)

(a) Floor gets spoiled

b)

(b) There is more resistance

c)

(c) Force of friction is high

d)

(d) Force of friction is very less

65.

Four children were asked to arrange forces due to rolling, static and sliding frictions in an increasing order. Their arrangements are given below. Choose the correct arrangement.

a)

(a) Rolling, Static, Sliding

b)

(b) Static, Rolling, Sliding

c)

(c) Rolling, sliding, static

d)

(d) Sliding, Static, Rolling

66.

Conduction of electricity in liquids occurs through electrons.

a)

True

b)

False

67.

When a liquid conducts electricity, a process other than conduction also takes place. What process is this?

a)

electrolysis

b)

electrochemical reaction

c)

electroplating

d)

oxidation

68.

Which of the following is not a conductor of electricity?

a)

tap water

b)

salt water

c)

petrol

d)

lime juice

69.

An electrolyte is a

a)

solid that conducts electricity.

b)

liquid that conducts electricity and breaks up chemically in the process.

c)

liquid that does not conduct electricity.

d)

solid that does not conduct electricity.

70.

On passing electricity through copper sulphate solution.

a)

copper is formed at anode.

b)

copper is formed at cathode

c)

oxygen is formed at anode.

d)

hydrogen is formed at cathode.

71.

A battery is used as a driving force in an electric circuit. True or false?

a)

True

b)

false

72.

Substances that do not conduct electricity are called (a)   .

73.
When current is passed through a mixture of water and lemon juice, bubbles rise from one of the electrodes. The bubbles are rising from the solution because
a)
of the heating effect of current
b)
of the chemical effect of current
c)
current produces magnetic field around the electrodes
d)
current always produces air bubbles when passed through a liquid
74.

The electrode thats connected to the positive terminal of the battery is called a

a)

anode

b)

cathode

c)

elctrode

75.

Which of these is plated on the iron to prevent it from chemically reacting with food?

a)

Gold

b)

Chromium

c)

Tin

d)

Zinc

76.

Sugar solution is a good conductor of electricity.

a)

True

b)

False

77.

Boojho’s uncle has set up an electroplating factory near his village.

He should dispose off the waste of the factory

a)

in the nearby river.

b)

in the corn field

c)

according to the disposal guidelines of the local authority.

d)

in the nearby pond

78.

When an electric current is passed through a conducting solution, there is a change of colour of the solution. This indicates

a)

the chemical effect of current.

b)

the heating effect of current.

c)

the magnetic effect of current.

d)

the lightning effect of current.

79.

Electroplating is based on

a)

Chemical effect of electricity

b)

Magnetic effect of electricity

c)

Heating effect of electricity

d)

Physical effect of electricity

80.

the phenomenon of decomposition of an electrolyte when electricity is passed through is known as

a)

conduction

b)

coating

c)

electrolysis

d)

electrorefining

81.

electrolyte that ionise completely to form free mobile ions in the solution is known as

a)

strong electrolytes

b)

weak electrolytes

c)

cathode

d)

anode

82.

which of the following is an application of electroplating.

a)

Electrorefining of metal

b)

extraction of metals from its ores

c)

to minimize the cost

d)

none of these

83.

the method of purification of metals by using electricity is known as

a)

electroplating

b)

electrorefining

c)

electrometal

d)

none of these

84.
Which of the following statements is incorrect about the conductivity of water?
a)
Rain water is a good conductor of electricity.
b)
On addition of table salt, water conducts electricity.
c)
On addition of lemon juice, water conducts electricity.
d)
Water becomes a good conductor of electricity when heated.
85.
When current is passed through a mixture of water and lemon juice, bubbles rise from one of the electrodes. The bubbles are rising from the solution because
a)
of the heating effect of current
b)
of the chemical effect of current
c)
current produces magnetic field around the electrodes
d)
current always produces air bubbles when passed through a liquid
86.

The object to be electroplated is taken as ____________ electrode.

a)

cathode

b)

anode

c)

electrode

d)

none of these

87.

The glowing of filament bulb is due to

a)

Chemical effect of current

b)

magnetic effect of current

c)

Physical effect of electric current

d)

Heating effect of electric current

88.

You perform an experiment taking similar bulbs and cells but two different solutions A and B. You find that the bulb in the setup A glows more brightly as compared to that of the setup B. You would conclude that

a)

higher current is flowing through the circuit in setup A

b)

higher current is flowing through the circuit in setup B

c)

equal current is flowing through both the circuits

d)

No conclusion

89.

Alloys of metals

a)

allow electric current to flow through them

b)

do not allow electric current to flow through them

c)

sometimes allow and sometimes do not allow electric current to flow through them

d)

None of these

90.

The article to be electroplated is made

a)

the anode

b)

the cathode

c)

either anode or cathode

d)

none of these

91.

The star which appears stationary from the earth

a)

Pole star

b)

Shooting Stars

c)

Sirius

d)

Alpha Centauri

92.

It takes nearly how many solar days for the moon to make one complete revolution around the earth?

a)

23.5

b)

24.5

c)

27.5

d)

29.5

93.

On which day, the earth lies between the moon and the sun?

a)

new moon day

b)

full moon day

c)

no moon day

d)

everyday

94.

how many stars are there in the constellation 'THE GREAT BEAR' ?

a)

5

b)

6

c)

7

d)

8

95.

In which year Neil Armstrong landed on the moon for the first time?

a)

1859

b)

1869

c)

1969

d)

1669

96.

Brightest star in the night sky

a)

sun

b)

Sirius

c)

Pole star

d)

Proxima centauri

97.

Stars appears to move from

a)

west to east

b)

north to south

c)

east to west

d)

south to north

98.

The distance of Alpha Centauri from the Earth is

a)

3.4 light year

b)

4.3 light year

c)

4.5 light year

d)

3.5 light year

99.

Solar means

a)

Sun

b)

Hot

c)

Lunar

d)

Planet

100.

........... is the closest planet to the sun.

a)

Venus

b)

Earth

c)

Mercury

d)

Mars

101.

Why does the moon look diferent every day?

a)

Because the moon revolves around earth

b)

Because its brightness changes

c)

Because it changes size over time

d)

Because it changes distance to earth

102.

A student finds that the length of a tree's shadow changes throughout the day. What does this show about earth?

a)

Earth tilts on its axis

b)

Earth rotates on its axis

c)

Earth is surrounded by air

d)

Earth revolves around the sun

103.

In the morning l, the sun apoears low in the sky,so objects cast ............. shadows.

a)

Low

b)

High

c)

Short

d)

Long

104.

Why do seasons occur?

a)

Because of the distance earth is from the sun

b)

Because earth tilts on its axis

c)

Because earth rotates on its axis

d)

Because earth is surrounded by air

105.

Why can you see some constellation only certain seasons?

a)

Erth revolves around the sun

b)

The stars grow dimmer over time

c)

Clouds block the light from the stars

d)

The stars move father away from Earth

106.

The inner planets are

a)

Jupiter Saturn Uranus Neptune

b)

Earth Jupiter Mars Neptune

c)

Mercury Neptune moon sun

d)

Mercury Venus Earth Mars

107.

The differences between inner planets and Outer planets are

a)

Inner planets are large and Rocky while outer planets are smaller and made mostly of gas

b)

Inner planets are large and made of gas while outer planet are smaller and Rocky

c)

Inner planet are small and Rocky while outer planets are large and made mostly of gas

d)

Inner planets are small and made of gas while outer planets are large and rocks

108.

What Moon phase is this?

a)

Waxing gibbous

b)

Waxing crescent

c)

Waning gibbous

d)

Waning crescent

109.

Identify ursa minor

a)
b)
c)
d)
110.

Identify hunter

a)
b)
c)
d)
111.

The planet whose axis of rotation is highly tilted

a)

jupiter

b)

saturn

c)

uranus

d)

neptune

112.

Which of the following is a non luminous celestial object?

a)

meteorite

b)

sun

c)

satellite

d)

star

113.

What type of galaxy is the Milky way galaxy?

a)

Spiral

b)

Irregular

c)

Elliptical

d)

Spherical

114.

Which of the following is the largest planet?

a)

Saturn

b)

Jupiter

c)

Earth

d)

Mars

115.
Which of these problems can be caused by air pollution?
a)
Respiratory problems
b)
Reduced food sources for humans
c)
Increased disease for humans
d)
Decrease in global temperatures
116.

What causes acid rain?

a)

High concentrations of sulfuric or nitric acid from pollution

b)

Fertilizer use

c)

Pesticide use

d)

CFCs

117.

Acid rain can damage

a)

Drinking water sources

b)

Aquatic life

c)

Architecture/buildings

d)

All options are correct

118.
The ozone layer protects us from
a)
UV rays
b)
CFCs
c)
Increased atmospheric heat
d)
Decreased atmospheric heat
119.

The ozone layer is damaged by

a)

CFCs

b)

Increase in greenhouse gases

c)

Increased global temperatures

d)

Sulfuric and nitric acids

120.
Which of the following are greenhouse gases?
a)
Carbon dioxide
b)
Methane
c)
Water vapor
d)
All answers are correct
121.
Increase in which gas is primarily responsible for increased global warming?
a)
Carbon dioxide
b)
Water vapor
c)
Methane
d)
Nitric oxides
122.
What does this diagram illustrate?
a)
Ozone Layer
b)
The Greenhouse Effect
c)
Ultraviolet Radiation
d)
Layers of the atmosphere
123.

A rapid growth of algae could lead to:

a)

A reduction of oxygen levels in the water

b)

Water that can support more life

c)

An increase in oxygen levels

124.

What can happen to fish when there is not enough oxygen in the water?

a)

They can suffocate

b)

They can't float

c)

They can't see

d)

Nothing. Fish don't need oxygen

125.
What is atomic number?
a)
Number of protons in an atoms 
b)
Number of neutrons in an atom
c)
Mass of an atom
d)
Charge on an atom
126.
Which subatomic particles are found in the nucleus of an atom?
a)
Protons and Electrons
b)
Protons and Neutrons
c)
Neutrons and Electrons
d)
Protons, Neutrons and Electrons
127.

What mass does a neutron have?

a)

1 amu

b)

0 amu

c)

-1 amu

d)

+2 amu

128.
The total number of protons and neutrons in an atom is called the...
a)
Atomic number
b)
Proton number
c)
Mass number
d)
Weight number
129.

How many electrons does a sodium atom have?

a)

23

b)

11

c)

12

d)

34

130.
Atoms of the same element must always have the same number of _________
a)
electrons
b)
neutrons
c)
isotopes
d)
protons
131.
What element is represented in this Bohr Model? 
a)
Carbon
b)
Hydrogen
c)
Aluminum
d)
Lithium
132.

How many neutrons does a silver atom with a mass of 108 amu have?

a)

47

b)

108

c)

61

d)

108

133.
This unit is represented by the combined number of protons and neutrons
a)
Atomic Mass
b)
Atomic Number
c)
Mass Number
134.
A design of an atom showing the nucleus as well as the electrons their designated orbits
a)
Periodic Table
b)
Bohr Model
c)
Electron Cloud
135.

Look at this picture of Argon off the periodic table. Which of the following is true for this element?

a)

18 protons

b)

40 protons

c)

22 protons

d)

21.9 protons

136.
Which of these phrases best describes an atom?
a)
a positive nucleus surrounded by a hard negative shell
b)
a positive nucleus surrounded by a cloud of negative charges
c)
a hard sphere with postive and negative charges on the outside
d)
a negative nucleus surrounded by protons and neutrons
137.
What is true about an atom?
a)
Most of the space in an atom is taken up by the nucleus
b)
Atoms are mostly empty space
c)
Atoms have no mass
d)
Electrons have much more mass that protons or neutrons.
138.
The term "neutral" means
a)
having only a little bit of charge
b)
having a positive charge
c)
having a negative charge
d)
having no charge at all
139.

The mass of an atom is

a)

equal to the number of protons

b)

the protons + electrons

c)

the protons + neutrons

d)

the protons + neutrons + electrons

140.

all the mass of an atom is located in

a)

the energy level

b)

the cloud

c)

the nucleus

d)

atom

141.
What scientist is best known for his gold foil experiment?
a)
J.J. Tomson
b)
Ernest Rutherford
c)
John Dalton
d)
Democritus
142.
What scientist first developed 5 rules for atomic theory, and helped kick start modern chemistry?
a)
J.J. Tomson
b)
Ernest Rutherford
c)
John Dalton
d)
Democritus
143.
Bonus question: What element is this an atom of?
a)
nitrogen
b)
lithium
c)
beryllium
d)
carbon
144.
Atoms of the same element with a different number of neutrons
a)
Ion
b)
Gluons
c)
Isotope
d)
Quarks
145.
The smallest particle of an element that shows all the properties of that element.
a)
Subatomic Particles
b)
Atom
c)
Quarks
d)
Gluons
146.
Discovered the electron within the atom
a)
Thomson
b)
Chadwick 
c)
Schrodinger & Heisenberg
d)
Dalton
147.
The only element with no neutrons in its nucleus.
a)
Oxygen
b)
Helium 
c)
Hydrogen
d)
Lithium
148.

What mass does a neutron have?

a)

1 amu

b)

0 amu

c)

-1 amu

d)

+2 amu

149.
Atoms of the same element must always have the same number of _________
a)
electrons
b)
neutrons
c)
isotopes
d)
protons
150.

What is the mass number of a nickel atom with 28 protons, 31 neutrons, and 28 electrons?

a)

31

b)

28

c)

59

d)

87

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