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Worksheets

Question Bank for Grade 8 Science

Total questions: 159

Worksheet time: 2hrs 50mins

Name
Class
Date
1.
Which statement best explains how periods on the periodic table are organized?
a)
increasing atomic number from left to right
b)
increasing number of neutrons from left to right
c)
decreasing number of electrons from left to right
d)
decreasing atomic mass number from left to right
2.
Where are the most reactive metals located on the periodic table?
a)
the uppermost complete row of the table
b)
the rows at the bottom of the table connecting two section
c)
the column at the far left side of the table
d)
the second column from the right side of the table
3.
Which elements are most likely to react in the same manner in a chemical reaction?
a)
elements in the same group
b)
elements in the same period
c)
elements with similar atomic masses
4.
If an element has no electrons to share and is stable, what family is it found in?
a)
alkali metals
b)
noble gases
c)
halogens
5.
Which property is unique for each element?
a)
mass number
b)
atomic number
c)
state of matter
6.
What coefficient for O2 demonstrates the law of conservation of mass?
CH4(g) + __O2(g) → CO2(g) + 2H2O(g)
a)
1
b)
2
c)
3
d)
4
7.
Which is best represented by the equation?
2Mg + O2 → 2MgO
a)
Law of Conservation of Energy
b)
Law of Conservation of Mass
c)
Law of Superposition
8.
What is the importance of a closed container in a chemical reaction?
a)
to observe the mass before and after the reaction occurs
b)
to keep any materials from interfering with the reaction
c)
to observe the loss of mass after the reaction occurs
9.
Which is a physical change?
a)
burning match 
b)
vinegar in baking soda 
c)
melting butter
d)
cooking an egg
10.
What is an example of a Chemical change?
a)
Ripped paper 
b)
boiled egg
c)
cracked egg
d)
sugar in water
11.

What is a compound

a)

sodium

b)

sugar

c)

nitrogen

d)

air

12.

Which is the best estimate of the melting point of Rubidium (Rb)?

a)

25* C

b)

40* C

c)

75* C

d)

184* C

13.

Two different liquids are poured together in an open container. Bubbles begin to form. After the bubbling stops, it is determined that the total weight of the two liquids is less than before they were poured together. Which best describes this observation?

a)

Some of the atoms during the reaction escaped into the air.

b)

Some of the atoms during the reaction were destroyed.

c)

Some of the atoms during the reaction became heavier.

d)

Some of the atoms during the reaction changed to a different kind of atom.

14.

This is a chemical reaction for the decomposition of carbonic acid into water and carbon dioxide.


How does this reaction support the Law of Conservation of Mass?

a)

Several molecules of water are produced.

b)

The mass of carbon atoms is reduced during the reaction.

c)

The mass of the atoms in the reactant equals the mass of the atoms in the products.

d)

The mass of hydrogen atoms is the only thing that remains the same before and after the reaction.

15.

Which is classified as an element?

a)

carbon dioxide

b)

iron

c)

vinegar

d)

water

16.

Which best describes the sequence o the elements in Period 5 of the periodic table?

a)

highly reactive gases, relatively non reactive metals, metalloids, very nonreactive gases, nonreactive nonmetals

b)

highly reactive metals, relatively nonreactive metals, metalloids, reactive nonmentals, reactive gases

c)

nonreactive gases, metalloids, nonreactive metals, highly reactive metals, highly reactive gases

d)

nonreactive gases, nonreactive metals, highly reactive metals, metalloids, reactive nonmetals, reactive gases

17.

Which statement is true about a chemical reaction?

a)

The physical states of the atoms in the reactants determine the products.

b)

Some of the atoms in the reactants will be a part of the products.

c)

The number of atoms in the reactants determines the products.

d)

All of the atoms in the reactants will be a part of the products.

18.

Chlorine has 7 valence electrons. With what group of elements will chlorine most readily bond?

a)

group 1

b)

group 2

c)

group 16

d)

group 18

19.

Which is the best example of a chemical change?

a)

butter melting

b)

egg cooking

c)

paper tearing

d)

water evaporating

20.

Which chemical equation best represents the Law of Conservation of Mass?

a)

 H + O → H2OH\ +\ O\ \rightarrow\ H_2O  

b)

 H2 + O2 → H2OH_2\ +\ O_2\ \rightarrow\ H_2O  

c)

 2H2 + O2 → 2H2O2H_2\ +\ O_2\ \rightarrow\ 2H_2O  

d)

 H2 + O2 → 2H2O2H_2\ +\ O_2\ \rightarrow\ 2H_2O_2  

21.

Which best represents a compound?

a)
b)
c)
d)
22.

Which best compares a homogeneous mixture and a heterogeneous mixture?

a)

Homogeneous mixtures are formed through physical changes, while heterogeneous mixtures are formed through chemical changes.

b)

Homogeneous mixtures are composed of two different liquids, while heterogeneous mixtures are composed of a solid and a liquid.

c)

The particles in a homogeneous mixture will separate if left undisturbed, while the particles in a heterogeneous mixture cannot be filtered out of the mixture.

d)

A homogenous mixture is the same throughout, while a heterogeneous mixture is not uniform throughout.

23.

Which is an example of a compound?

a)

O2

b)

2Cl

c)

H2SO4

d)

Hydrogen

24.

Which pair of elements has the most similar properties?

a)

Li and B

b)

I and Ca

c)

K and He

d)

N and P

25.

Why are the noble gases such as helium (He) and neon (Ne) grouped together in the periodic table?

a)

They are nonreactive gases.

b)

They are highly reactive metallic solids.

c)

They are dangerous gases when combined with water.

d)

They are liquid at room temperature and have high boiling points.

26.

What category of elements is found between the metals and nonmetals on the periodic table?

a)

synthetic

b)

metalloids

c)

radioactive

d)

noble gases

27.

Properties such as magnetism, luster (shine), and malleability have been used to group together which category of elements on the periodic table?

a)

metals

b)

nonmetals

c)

metalloids

d)

noble gases

28.

What happens to water molecules during the boiling process?

a)

They move faster and move farther apart as they absorb heat.

b)

They move faster and remain close together as they absorb heat.

c)

They move more slowly but move farther apart as they lose heat.

d)

They move faster and move farther apart as they lose heat.

29.

Which shows one example of a physical change and one example of a chemical change?

a)

boiling water and melting wax

b)

rusting iron and baking a cake

c)

dissolving powder and shredding paper

d)

freezing water and burning coal

30.

Which is the best evidence that the creation of a precipitate is the result of a chemical reaction?

a)

demonstrates gas production

b)

demonstrates a temperature change

c)

demonstrates a new substance has formed

d)

None of the above provide evidence of a chemical change.

31.

If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?

a)

12 atoms of carbon (C)

b)

6 atoms of carbon (C)

c)

3 atoms of carbon (C)

d)

2 atoms of carbon (C)

32.

How does a balanced chemical equation satisfy the Law of Conservation of Mass?

a)

During a chemical reaction, the total amount of matter stays the same.

b)

During a chemical reaction, matter is destroyed.

c)

During a chemical reaction, one or more new substances are formed.

d)

During a chemical reaction, the total number of atoms increases.

33.

When wood is burned, it is changed into ash and carbon is released into the atmosphere as smoke. If 2 kg of wood were burned, how much ash would result?

a)

exactly 2 kg because mass is conserved in this system

b)

less than 2 kg because some of the mass is lost as gas

c)

greater than 2 kg because carbon is added to the system

d)

greater than 2 kg because carbon is added to the system

34.

A compound containing potassium (K), chlorine (Cl), and oxygen (O) has the chemical formula KClO . Which best represents a balanced chemical reaction showing the breakdown of KClO into simpler substances?

a)

2KClO3 → 2KCl

b)

2KClO3 → Cl2 + 3O2

c)

2KClO3 → 2K + 3O2

d)

2KClO3 → 2KCl + 3O2

35.

A researcher combines 37 grams of iron with 16 grams of oxygen. Based on the Law of Conservation of Mass, what will be the resulting mass of the product?

a)

16 grams

b)

21 grams

c)

37 grams

d)

53 grams

36.

An element is identified by

a)

its number of protons.

b)

the atomic mass.

c)

the type of charge.

d)

its number of isotopes.

37.

The chemical formula for baking soda is NaHCO3. How many different elements make up baking soda?

a)

1

b)

2

c)

3

d)

4

38.

How are elements ordered in the modern periodic table?

a)

by date of discovery

b)

by decreasing atomic mass

c)

by increasing atomic number

d)

by alphabetical order of element symbols

39.

What general category describes the majority of the elements in the periodic chart?

a)

metals

b)

liquids

c)

nonmetals

d)

gases

40.

Because an element can not be broken down into a simpler substance, it is considered to be

a)

a chemical impurity

b)

a chemical substance

c)

a pure substance

d)

unbreakable

41.

An example of a pure substance is

a)

gold

b)

salad

c)

sweet tea

d)

electron clouds

42.

In an element

a)

there are many different substances

b)

the atoms are all the same

c)

the atoms are all different

d)

the electrons, protons and neutrons are located in the nucleus

43.

Which of the following is NOT a compound?

a)

aluminum (Al)

b)

salt (NaCl)

c)

water (H2O)

d)

sugar (C6H12O6)

44.

Atoms move quickly and randomly in which state of matter?

a)

solid

b)

liquid

c)

gas

d)

none of these

45.

Which of the following is formed when two elements combine chemically?

a)

a compound

b)

a mixture

c)

an atom

d)

an electron

46.

Sodium is an element found in table salt. It contains 11 protons and 12 neutrons. How many electrons are found in a neutral atom of sodium?

a)

23

b)

12

c)

11

d)

1

47.

If a highly-reactive metal with one valence electron is discovered, in which group would the element best fit?

a)

group 1

b)

group 2

c)

group 17

d)

group 18

48.

An engineer needs a hard, non-magnetic semiconductor. Which element would best fit this description?

a)

aluminum (Al)

b)

carbon (C)

c)

silicon (Si)

d)

silver (Ag)

49.
Which pair of elements has the most similar properties?
a)
Li and B
b)
I and Ca
c)
K and He
d)
N and P
50.
Which elements are most likely to react in the same manner in a chemical reaction?
a)
elements in the same group
b)
elements in the same period
c)
elements with similar atomic masses
51.
Matter can not be created nor destroyed: it can only be
a)
Destroyed a little bit
b)
Invisible
c)
Transformed, changed
d)
None of the above
52.
The number to the lower side of an element is a 
a)

Subscript

b)

Superscript

c)

Coefficient

d)

Charge

53.
The number in front of a compound or element is a 
a)

Subscript

b)

Coefficient

c)

Superscript

d)

Charge

54.
A chemical reaction is balanced when
a)

both sides have the same elements

b)

Both sides have the same  number of atoms

c)

Same subscripts

d)

Same coefficients

55.
The coefficient in  3H2O is
a)
6
b)
2
c)
3
d)
5
56.
If reaction starts with 20g of reactants it should produce 
a)

a total of 40g of products

b)

a total of 10g of products

c)

a total of 80 g of products

d)

a total of 20g of products

57.
In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams does reactant B should have? 
a)

4g

b)

5g

c)

9g

d)

14g

58.
Measure of the amount of matter 
a)
mass
b)
volume
c)
weight
d)
density
59.
Since gasses weigh nothing, when they are produced in a reaction they do not have to be accounted for.  
a)

True

b)

False

c)

Beans

d)

Gas-X

60.
Which are the reactants in the following reaction?
2Mg + O2 ---> 2MgO 
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
61.
How many oxygen atoms are in this chemical formula?
a)
6 oxygen atoms
b)
2 oxygen atoms
c)
3 oxygen atoms
d)
4 oxygen atoms
62.
Bob puts 200 grams of ice into a pitcher with 900 grams of water. He gets distracted and comes back later to find that the ice has melted in the water. How many grams of water does Bob now have in the pitcher?
a)
200 g
b)
700 g
c)
1,100 g
63.
24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride
a)

62 

b)

38

c)

24

d)

14

64.
When CaCO3 is heated, it forms CaO and CO2. Which of these statements best describes the mass of the products if 100 g of CaCO3 is heated?
a)
The difference in the products’ masses is equal to the mass of the CaCO3
b)
The sum of the products’ masses is less than the mass of the CaCO3
c)
The mass of each product is equal to the mass of the CaCO3
d)
The sum of the products’ masses equals the mass of the CaCO3
65.
Which is an alkali metal?
a)
Magnesium
b)
Iron
c)
Sodium
d)
Europium
66.
The atom with the largest atomic radius in Group 18 is - 
a)
Ar
b)
He
c)
Kr
d)
Rn
67.
The element with the smallest ionization energy in Period 6 is - 
a)
Rn
b)
Cs
c)
Os
d)
Tm
68.
Families all have similar 
a)
Names
b)
atomic numbers
c)
atomic masses
d)
properties
69.

Atomic radius DECREASES when

a)

when you go across a row from right to left

b)

when you go down a group

c)

when you go across a row from left to right

d)

when you go across a group from left to right

70.

What element is the most electronegative

a)

chlorine

b)

bromine

c)

iodine

d)

astatine

71.

How many electron shells does the pictured atom have?

a)

1

b)

2

c)

3

d)

4

72.

How many valence electrons does the pictured atom have?

a)

20

b)

3

c)

2

d)

4

73.

Which one appears least on the periodic table?

a)

Metals

b)

Metalloids

c)

Non-Metals

74.
Measure mainly of the nuclear particles: protons + neutrons
a)
Subatomic Particles
b)
Atomic Number
c)
Atomic Mass
d)
Gluons
75.

What is the group with the highest ionization level?

a)

Halogens

b)

Alkali Metals

c)

Alkali-Earth Metaks

d)

Transition Metals

76.

The least reactive elements are found in which group?

a)

Alkali Metals

b)

Alkaline Earth Metals

c)

Halogens

d)

Noble Gases

77.

"I am a brittle solid!" To which part of the Periodic Table do I belong?

a)

metalloids

b)

nonmetals

c)

metals

d)

transition metals

78.

As the group number decreases, what else decreases?

a)

atomic size

b)

electronegativity

c)

atomic symbol

d)

electropositivity

79.

As the period number increases, what else is increasing?

a)

atomic size

b)

electronegativity

c)

ionization energy

d)

valence electrons

80.

Soup that has no visible chunks or differences is what type of mixture?

a)

potable

b)

homogeneous

c)

heterogeneous

d)

low turbidity

81.

A compound is make up of how many different types of atoms?

a)

1

b)

2 or more

c)

none

d)

any amount

82.

What makes each element different from any other kind of element?

a)

the number of protons in the nucleus

b)

the number of neutrons in the nucleus

c)

the number of electrons around the nucleus

d)

the size and shape of the element

83.

Which part of the atom is positively charged?

a)

electron cloud

b)

orbitals

c)

neutrons

d)

nucleus

84.

What element is it?

a)

Lithium (Li) (3)

b)

Hydrogen (H) (1)

c)

Beryllium (Be) (4)

d)

Carbon (C) (6)

85.

An element has 2 energy levels and 2 valence electrons. What element is it?

a)

Lithium (Li) (3)

b)

Beryllium (Be) (4)

c)

Helium (He) (2)

d)

Magnesium (Mg) (12)

86.

Which best describes elements found in a group of the periodic table?

a)

the elements have similar chemical properties

b)

the elements have the same atomic number

c)

the elements have the same size atoms

d)

the elements are naturally found in the same state

87.

Which of the following is true about a mixture?

a)

they cannot be separated

b)

they can be separated

c)

they can be separated

d)

they form a chemical combination of two or more atoms

88.

Which of the following is made from one or more elements?

a)

gold

b)

nitrogen gas

c)

hydrogen

d)

sugar

89.

Which of the following is a heterogeneous mixture?

a)

salt water

b)

brass

c)

coffee

d)

oil and water

90.
a)

Element

b)

Compound

c)

Homogeneous Mixture

d)

Heterogeneous Mixture

91.

Sweet Tea, everything is mixed evenly and looks the same.

a)

Heterogeneous Mixture

b)

Homogeneous Mixture

92.
a)

Element

b)

Compound

c)

Homogeneous Mixture

d)

Heterogeneous Mixture

93.
a)

Element

b)

Compound

c)

Homogeneous Mixture

d)

Heterogeneous Mixture

94.

Pick the best answer.

a)

Homogeneous Mixture

b)

Heterogeneous Mixture

c)

Molecules

d)

We live in Wilmington. We don't get snow.

95.

2 or more different elements that are bonded together is called...

a)

A. element

b)

B. compound

c)

C. mixture

d)

D. solution

96.
A substance that contains only one type of atom is a(n)
a)
compound
b)
element
c)
heterogeneous mixture
d)
homogeneous mixture
97.
Which of the following lists only elements?
a)
H2O + OH, MgCl2
b)
H2O, KF, Ne
c)
KCl, Ag, Au
d)
K, Cl, N
98.

Jay combines water, sugar, and lemon juice to form lemonade. What type of substance was made?

a)

Element

b)

Molecule

c)

Mixture

d)

A drink

99.
Which of the following is an example of a heterogenous mixture?
a)
soap
b)
a salad with lettuce, olives, and tomatoes
c)
cup of coffee
d)
water
100.
This type of mixture looks the same throughout. 
a)

Homogenous

b)

Heterogeneous

c)

Molecules

d)

Compounds

101.
a)
element
b)
compound
c)
mixture of elements and compounds
d)
mixture of compounds
102.
a)
element
b)
compound
c)
mixture of elements
d)
mixture of compounds
103.
a)
element
b)
compound
c)
mixture of elements
d)
mixture of compounds
104.

What is considered the simplest form of matter?

a)

Compounds

b)

Colloids

c)

Solutions

d)

Elements

105.
Contains two or more atoms combined
a)

Elements

b)

Compounds

c)

Mixtures

d)

Protons

106.
Elements can be broken down into simpler substances. 
a)
false 
b)
true 
c)
sometimes 
107.
Classify the picture with the correct label.
a)
Mixture of Compounds
b)
Mixture of Elements
c)
Compound
d)
Mixture of Elements & Compounds
108.
Classify the picture with the correct label.
a)
Element
b)
Compound
c)
Mixture of Compounds
d)
Mixture of Elements
109.
Water is a ___________. 
a)
element 
b)
mixture 
c)
compound 
110.
These must be separated chemically. 
a)
elements 
b)
compounds 
c)
mixtures 
d)
homogeneous mixtures 
111.
As you move down a group, atomic radius increases because - 
a)
you add more and more neutrons
b)
you add more and more protons
c)
you add more and more shells (energy levels)
d)
you add more atomic mass
112.

Mendeleev was the first person to arrange the elements into a table. How did he arrange the rows?

a)
alphabetical 
b)
density
c)
melting point
d)
atomic mass
113.

Which of the following will have similar properties?

a)

O, S, Se

b)

O, F, Ne

c)

N, Ne, Na

d)

H, K, P

114.
Each column in the periodic table is called a _________ .
a)
period
b)
group
c)
cluster
d)
unit
115.

Elements in the same group have : (2 correct answers)

a)

Similar chemical properties

b)

Similar names

c)

Same number of outer (valence) electrons)

d)

The same number of protons

116.
Which is an alkali metal?
a)
Magnesium
b)
Iron
c)
Sodium
d)
Europium
117.
Which is a halogen?
a)
Helium
b)
Chlorine
c)
Oxygen
d)
Neptune
118.

Find an element with similar chemical properties to Barium (Ba).

a)

Ca an Ra, because they are in the same group and have similar chemical properties.

b)

Cs and La, b/c they are in the same period number.

c)

Ca and Y, b/c they are 90 degree angle and have similiar properties.

119.

The blue elements (left side) are called 

a)
metals
b)
nonmetals
c)
metalloids
d)
noble gases
120.

The yellow elements (right side) are called 

a)
metals
b)
nonmetals
c)
metalloids
d)
noble gases
121.
Which elements have the most similar chemical properties?
a)
K and Na
b)
K and Ca
c)
K and Cl
d)
K and S
122.
The atoms along the staircase are called 
a)
metals
b)
nonmetals
c)
metalloids
d)
noble gases
123.

What do the periods (rows) represent?

a)

an additional energy level

b)

an additional proton

c)

an additional group

d)

an additional electron

124.

Put the groups of the periodic table in order from group 1A to group 8A (18).

a)

alkali metals

b)

alkaline earth metals

c)

halogens

d)

noble gases

1)
2)
3)
4)
125.

Match the following elements to the group they belong to.

a)

sodium

1.

alkali metal

b)

calcium

2.

alkaline earth metal

c)

chlorine

3.

halogen

d)

argon

4.

noble gas

126.
The atomic number tells you what?
a)
number of electrons
b)
number of protons
c)
number of neutrons
d)
both electrons and protons in an atom.
127.
What is the name of the group that never reacts--ever ever they are stable with a full outermost ring!!!
a)
noble gases
b)
transition
c)
halogens
d)
borons
128.
The horizontal row on the periodic table is called a
a)
group
b)
family
c)
period
d)
atomic number
129.
Which element is found in group 16 period 3?
a)
Sulfur (S)
b)
Selenium (Se)
c)
Chlorine (Cl)
d)
Carbon (C)
130.
Which element is found in group 18 period 4?
a)
Neon (Ne)
b)
Chlorine (Cl)
c)
Krypton (Kr)
d)
Xenon (Xe)
131.
Which element is found in period 3 group 2?
a)
Sodium (Na)
b)
Magnesium (Mg)
c)
Yttrium (Y)
d)
Boron (B)
132.
Which element is found in group 2 period 7?
a)
Radium (Ra) 
b)
Radon (Rn)
c)
Stontium (Sr)
d)
Lutetium (Lu)
133.
Which element is found in group 6 period 5?
a)
Chromium (Cr)
b)
Tungsten (W)
c)
Molybdenum (Mo)
d)
Tantalum (Ta)
134.

Elements on the Periodic Table of the Elements are classified into categories such as

a)

rocks and minerals

b)

molecules and atoms

c)

metals and nonmetals

d)

physical and chemical properties

135.

Elements that have the same number of energy levels are said to be in the same ______.

a)

group

b)

period

c)

family

d)

classification

136.

What do the horizontal rows on the periodic table tell us?

a)

The number of orbitals

b)

The number of valence electrons (the electrons on the outer most shell)

137.

What does the number of proton tell us?

a)

electrons

b)

atomic number

c)

atomic mass

d)

neutrons

138.

How do you calculate the number of neutrons? *

a)

Mass = Atomic number - Neutrons

b)

Mass - Atomic number = Neutrons

c)

Atomic number = Neutrons

139.

What is the atomic mass?

a)

58.693

b)

28

c)

86.693

d)

Ni

140.

How many protons and electrons does nickel have?

a)

28

b)

58.69

c)

86.693

d)

Ni

141.

How many orbitals does Nickel have?

a)

3

b)

4

c)

5

d)

10

142.

Group 1 is called the...

a)

Halogens

b)

Noble Gases

c)

Nonmetals

d)

Alkali Metals

143.

Group 17 is called...

a)

Halogens

b)

Noble Gases

c)

Nonmetals

d)

Alkali Metals

144.

Group 18 is called

a)

Halogens

b)

Noble Gases

c)

Nonmetals

d)

Alkali Metals

145.

The correct chemical symbol for sodium is...

a)

Na

b)

NA

c)

S

d)

So

146.

Subatomic particles with a negative charge

a)

Electrons

b)

Neutrons

c)

Protons

d)

Quarks

147.
Subatomic particles with a positive charge
a)
neutrons
b)
atomic mass
c)
protons
d)
isotopes
148.
Measure mainly of the nuclear particles: protons + neutrons
a)
Subatomic Particles
b)
Atomic Number
c)
Atomic Mass
d)
Gluons
149.
Value representing the number of protons in an element
a)
Atomic Mass
b)
Mass Number
c)
Valence Electrons
d)
Atomic Number
150.
Subatomic particles that are neutral in charge
a)
Neutrons
b)
Protons
c)
Nucleus 
d)
Electrons
151.
Where electrons are likely to be found as they travel around the nucleus
a)
Nucleus
b)
Electron Cloud
c)
Within a Proton
d)
Within a Neutron
152.
Arrangement of elements organized by atomic number
a)
Electron Cloud 
b)
Periodic Table 
c)
Electron Configuration
d)
None of these
153.

The smallest particle of an element.

a)

Element

b)

Molecule

c)

Atom

154.

Proposed that electrons move around the nucleus in specific layers, or shells.

a)

Bohr

b)

Rutherford

c)

Chadwick

d)

Thomson

155.

Which of the following is/are conclusions based on Rutherford’s gold foil experiment?

a)

Atom is mostly empty space

b)

The nucleus is positively charged

c)

The atom has a small dense nucleus

d)

All answers are correct

156.
How many electrons does this picture show?
a)
4
b)
5
c)
6
d)
3
157.

Who named the positive center of the atom the "nucleus?"

a)

Democritus

b)

Dalton

c)

Thomson

d)

Rutherford

158.

Who discovered that atoms are mostly empty space?

a)

Dalton

b)

Thomson

c)

Rutherford

d)

Bohr

159.

Who proposed that electrons move around the nucleus in circular orbits?

a)

Dalton

b)

Thomson

c)

Rutherford

d)

Bohr

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