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Atoms Review

Total questions: 49

Worksheet time: 1hrs 26mins

Name
Class
Date
1.
all matter is made of what 
a)
energy 
b)
atoms 
c)
electrons 
d)
compounds 
2.
The positive particles of an atom are 
a)
electrons 
b)
positrons 
c)
neutrons 
d)
protons 
3.
the central region of an atom where its neutrons and protons are is its 
a)
nucleus 
b)
electron cloud
c)
core 
d)
center 
4.
an atom with atomic number 6 would have how many protons 
a)
6
b)
12
c)
3
d)
cannot be determined 
5.
Particles in an atom that are neutral and have no charge are 
a)
negatrons 
b)
electrons 
c)
neutrons 
d)
protons 
6.
True or False? Neutrons have a negative charge
a)
True
b)
False
7.
What is the atomic number for an element with three protons?
a)
2
b)
1
c)
3
d)
6
8.
The subatomic particle with a negative charge is the
a)
electron
b)
proton
c)
neutron
d)
nucleus 
9.
What is the mass number?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
10.
The particles that are found in the nucleus of an atom are
a)
neutrons and electrons
b)
electrons only
c)
protons and neutrons
d)
protons and electrons
11.
Which element is this on the periodic table?
a)
3rd element
b)
7th element
c)
13th element
d)
6th element
12.
The smallest particle into which an element can be divided and still be the same substance is a(n) ________.
a)
atom
b)
nucleus
c)
proton
d)
neutron
13.
Which of the following determines the identity of an element?
a)
atomic number 
b)
mass number
c)
atomic mass
d)
overall charge
14.
Two atoms of the same element but with different mass numbers are called________
a)
electrons
b)
isotopes
c)
variables
d)
electron cloud
15.
An atom with an unequal number of protons and electrons is said to have (a) ___.
a)
no charge
b)
balance
c)
charge
d)
unbalance
16.
What does the 1.00794 stand for?
a)
Hydrogen
b)
atomic number
c)
atomic mass
d)
atomic explosion
17.
What is the atomic number?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
18.
If the number of protons equal the number of _____, the atom will have no charge
a)
protons
b)
neutrons
c)
electrons
d)
nucleus
19.
An atoms overall charge is 
a)
positive 
b)
depends on its mood 
c)
neutral 
d)
negative 
20.

Which element is shown in the Bohr model?

a)

Helium because it has 2 valence electrons

b)

Magnesium because it has an atomic number of 12.

c)

Chromium because is has an atomic mass of 24.

d)

Argon because it has 18 total subatomic particles.

21.

Which statement is best used to identify the Bohr model as Aluminum?

a)

It has 13 protons.

b)

It has 3 valence electrons.

c)

It has 3 energy levels.

d)

It has 14 neutrons.

22.

Which of these best describes one of the subatomic particles that could be found at location X?

a)

It has mass and a positive charge.

b)

It has no mass but a positive charge.

c)

It has no mass and no charge.

d)

Cannot be determined.

23.

Which of these statements is true about location X?

a)

It has all of the subatomic particles.

b)

It determines an element's reactivity.

c)

It has very little mass.

d)

It contains the atomic mass.

24.

This model shows which element?

a)

Helium

b)

Beryllium

c)

Manganese

d)

Silicon

25.

An element has 5 protons, 6 neutrons, and 5 electrons. What is the charge of the nucleus?

a)

+5

b)

+6

c)

+11

d)

-5

26.

An element has 5 protons, 6 neutrons, and 5 electrons. How many total subatomic particles does it have?

a)

5

b)

10

c)

11

d)

16

27.

Which statement is true?

a)

A proton is the same size as an electron but smaller than a neutron.

b)

An electron is the same size as a proton and bigger than a neutron.

c)

A neutron is the same size as a proton and much bigger than an electron.

d)

A neutron is the same size as a proton but much smaller than an electron.

28.

Which answer below is correct?

a)

A is negative; B is positive; C is neutral

b)

A is neutral; B is positive; C is negative

c)

A is positive; B is neutral; C is negative

d)

A is negative; B is neutral; C is positive

29.

This model shows which element?

a)

Oxygen

b)

Radium

c)

Barium

d)

Cannot be determined

30.
How many sig. fig. are in the number below:
350.540
a)
4
b)
5
c)
6
d)
7
31.
Which measurement contains 3 sig figs?
a)
200 mL
b)
20.0 mL
c)
0.02 mL
d)
0.020mL
32.
What is the correct number of sig figs in 10500
a)
3
b)
2
c)
4
d)
5
33.
Which value has only 4 significant digits? 
a)
6.930
b)
0.450
c)
8450
d)
0.392
34.
Round 720.36 to two sig figs
a)
72
b)
73
c)
720
d)
720.00
35.
What is 98.907 rounded to 1 significant figure?
a)
98.9
b)
90
c)
100
d)
98.91
36.
Which of the following measurements contains two significant figures?
a)
0.00400 L
b)
0.00404 L
c)
0.00044 L
d)
0.00440 L
37.
Find the sum 3.35 + 1.4 + 3.65
a)
8.9
b)
8.22
c)
8.43
d)
8.4
38.
Solve & Round to Correct Sig Figs.
4.5 x 2.34 = 
a)
11
b)
10.52
c)
10.5
d)
10
39.
Solve & Round to Correct Sig Figs.
100 / 2 = 
a)
50
b)
50.
c)
50.0
d)
50.00
40.
Solve & Round to Correct Sig Figs.
207 + 2 = 
a)
209
b)
210
c)
209.0
d)
209.00
41.
24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?
a)
74.92 amu
b)
24.97 amu
c)
75.01 amu
d)
74.51 amu
42.

An element with 4.35% have a mass of 49.9461 amu, 83.79% have amass of 51.9405 amu, 9.50% have a mass of 52.9407 amu, and 2.36% have a mass of 53.9389amu. What is the atomic mass?

a)

51.99 amu

b)

52.19 amu

c)

53.45 amu

d)

17.33 amu

43.
What is Half-life?
a)
The amount of time it takes for some of the nuclei in a sample of the isotope to decay
b)
The amount of time it takes for half the electrons in a sample of the isotope to decay
c)
The amount of time it takes for half the nuclei in a sample of the isotope to decay
d)
the amount of time it takes to double the nuclei in a sample of the isotope to decay
44.
The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?
a)
100.0g
b)
50.0g
c)
12.5g
d)
8.5g
45.
Uranium-238  decays into  Thorium-234  by emitting .........
a)
an alpha particle
b)
a beta particle
c)
gamma rays
d)
visible light
46.
Which type of nuclear radiation is being emitted here?
a)
alpha
b)
beta
c)
gamma
d)
none
47.
If the half-life of uranium-232 is 70 years, how many half-lives will it take for 10 g of it to be reduced to 1.25 g?
a)
1 half-life
b)
2 half-lives
c)
3 half-lives
d)
4 half-lives
48.

A sample of wood that originally contained 100 grams of carbon-14 now contains only 25 grams of carbon-14. Approximately how many years ago was this sample part of a living tree? The half life of Carbon-14 is about 5,700 years.

a)

2,850 years

b)

5,700 years

c)

11,400 years

d)

17,100 years

49.

If 10 mg of iodine 131 is given to a patient, and 1.25 mg is left after 24 days, what is the half-life of iodine-131?

a)

8

b)

3

c)

43.6

d)

72

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