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Electron Configuration & Half-Lives

Total questions: 84

Worksheet time: 2hrs 44mins

Name
Class
Date
1.

How much of a 100.0g sample of Au - 198 is left after 8.10 days if its half - life is 2.70 days?

a)

12.5 g

b)

25.0 g

c)

50.0 g

d)

6.25 g

2.

The half - life of radon - 222 is 3.8 days. How much of a 100 g sample is left after 15.2 days.

a)

50.0 g

b)

25.0 g

c)

12.5 g

d)

6.25 g

3.

A 50.0 g sample of N - 16 decays to 12.5 g in 14.4 seconds. What is it's half - life?

a)

14.4 sec

b)

7.2 sec

c)

3.6 sec

d)

1.8 sec

4.

The half - life of K - 42 is 12.4 hrs. How much of a 750 g sample is left after 62.0 hrs?

a)

187.5 g

b)

93.8 g

c)

46.9 g

d)

23.4 g

5.

If 100 g of Au - 198 decays to 6.25 g in 10.8 days, what is the half - life of Au - 198?

a)

1.8 days

b)

2.7 days

c)

3.6 days

d)

5.4 days

6.
What type of radioactive decay is shown here?
a)
Alpha decay
b)
Beta decay
c)
Gamma decay
7.
An isotope of an element has the same number of _________, but a different number of _________.
a)
Protons, electrons
b)
Protons, neutrons
c)
Electrons, neutrons
8.
What type of nuclear reaction occurs in the Sun?
a)
Nuclear fission
b)
beta decay
c)
alpha decay
d)
Nuclear fusion
9.
What type of decay is shown here
a)
alpha decay
b)
beta decay
c)
gamma decay
10.
Which particles make up the nucleus of an atom?
a)
protons and neutrons
b)
electrons and protons
c)
electrons, protons, and neutrons
d)
electrons and neutrons
11.
After the third half-life, how much of the sample is left?
a)
1/2
b)
1/3
c)
1/16
d)
1/8
12.
After the third half-life, how much of the sample is left?
a)
1/2
b)
1/3
c)
1/16
d)
1/8
13.
The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?
a)
3.0g
b)
0.25mg
c)
0.3g
d)
0.25g
14.

Negatively charged particles emitted from a nucleus at a high speed are

a)

X-rays

b)

gamma particles

c)

alpha particles

d)

beta particles

15.

A helium nucleus with two protons and two neutrons is called a(n)

a)

electroscope

b)

gamma particle

c)

alpha particle

d)

beta particle

16.
Takes two small nuclei and combines them into a larger nucleus
a)
fission
b)
fusion
17.
The splitting of a nucleus into smaller nuclei is
a)
fusion
b)
fission
c)
half-life
d)
gamma radiation
18.

The amount of material left after two half-lives is ____ of the original value.

a)

double

b)

one-half

c)

one-fourth

d)

four times

19.

The most penetrating type of radiation is

a)

the gamma ray

b)

the beta particle

c)

the alpha particle

d)

the uranium atom

20.

The most penetrating type of radiation is

a)

the gamma ray

b)

the beta particle

c)

the alpha particle

d)

the uranium atom

21.

When the strong force is not enough to hold the nuclei together permanently, what occurs?

a)

solids become liquids

b)

nuclear fusion occurs

c)

the nuclei decay

d)

carbon -12 changes to carbon-14

22.

The half-life of lead is about 11 hours. How much of a 150 gram sample of lead is left after 22 hours

a)

75 g

b)

50 g

c)

37.5 g

d)

13.6 g

23.

The half-life of Thorium-234 is 24 days. How many half-lives have passed after 96 days?

a)

One half-life

b)

Two half-lives

c)

Three half-lives

d)

Four half-lives

24.
What is the half-life of iodine-131?
a)
32 days
b)
8 days
c)
16 days
d)
24 days
25.

The % of the parent isotope remaining after 1 Half Life.

a)

50%

b)

25%

c)

12.5%

d)

6.25%

26.

The % of the parent isotope remaining after 2 Half Lives.

a)

50%

b)

25%

c)

12.5%

d)

6.25%

27.

What is the Half life of this isotope?

a)

5 seconds

b)

10 seconds

c)

15 seconds

d)

20 seconds

28.

What is the Half Life of this isotope?

a)

3 days

b)

5 days

c)

8 days

d)

10 days

29.
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
30.
If one-fourth of the carbon-14 is remaining then how many half-lives have passed?
a)
1
b)
2
c)
3
d)
4
31.

Why do some elements have half-lives?

a)

they radioactively decay

b)

half of their atom gets stolen

c)

They are Twizzlers that break in half

32.

What is the only difference between two different isotopes of the same element?

a)

Number of neutrons

b)

Number of protons

c)

Number of electrons

d)

Size of atom

33.

After the third half-life, how much of the sample is left?

a)

1/2

b)

1/3

c)

1/16

d)

1/8

34.

Choose the correct electron configuration for Beryllium (Be).

a)

1s1

b)

1s2 2s2

c)

1s2 2s2 2p1

35.

Choose the correct electron configuration for Chlorine (Cl).

a)

1s2 2s2 2p1

b)

1s2 2s2 2p6 3s2

c)

1s2 2s2 2p6 3s2 3p5

36.

Choose the correct electron configuration for Nickel (Ni).

a)

1s2 2s2 2p6 3s2 3p6 4s2 3d8

b)

1s2 2s2 2p6 3s2 3p6 4s2 3d2

c)

1s2 2s2 2p6 3s2 3p6 4s10

37.

Choose the correct electron configuration for Krypton (Kr).

a)

1s2 2s2 2p6 3s2 3p6 4s8 3d8

b)

1s2 2s2 2p6 3s2 3p6 4s2 3d8 4p3

c)

1s2 2s2 2p6 3s2 3p6 4s2 3d8 4p6

38.

Choose the correct electron configuration for Terbium (Tb).

a)

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d19 5p6 6s2

b)

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f9

c)

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f5

39.

Choose the correct electron configuration for Beryllium (Be).

a)

1s1

b)

1s2 2s2

c)

1s2 2s2 2p1

40.

Choose the correct electron configuration for Chlorine (Cl).

a)

1s2 2s2 2p1

b)

1s2 2s2 2p6 3s2

c)

1s2 2s2 2p6 3s2 3p5

41.
What is the noble gas configuration for beryllium?
a)
[He]1s2
b)
[He]2s2
c)
[Li]2s1
d)
[Li]2s2
42.
What is the noble gas configuration for boron?
a)
[He]1s22s2
b)
[He]2s22p2
c)
[He]2s22p1
d)
[Li]2s22p1
43.
What is the noble gas configuration for Sulfur?
a)
[Ar] 3p4
b)
[He] 3s2 3p4
c)
[Ne] 3s2 3p4
d)
[Na] 3s2 3p4
44.

Choose the correct electron configuration for Nickel (Ni).

a)

1s2 2s2 2p6 3s2 3p6 4s2 3d8

b)

1s2 2s2 2p6 3s2 3p6 4s2 3d2

c)

1s2 2s2 2p6 3s2 3p6 4s10

45.

Choose the correct electron configuration for Krypton (Kr).

a)

1s2 2s2 2p6 3s2 3p6 4s8 3d8

b)

1s2 2s2 2p6 3s2 3p6 4s2 3d8 4p3

c)

1s2 2s2 2p6 3s2 3p6 4s2 3d8 4p6

46.

What element has the following electron configuration: 1s2 2s2 2p6 3s2?

a)

Ca+2

b)

Ca

c)

Mg

d)

Na

e)

Ar

47.

Match the elements with their electron configuration! (3 minutes)

a)

1s2 2s2 2p3

1.

Nitrogen, N

b)

1s2 2s2 2p6 3s2 3p3

2.

Phosphorus, P

c)

1s2

3.

Helium, He

d)

1s2 2s2 2p6 3s2 3p6

4.

Argon, Ar

e)

1s2 2s2 2p6 3s2 3p6 4s2 3d5

5.

Manganese, Mn

48.

What is the configuration for Carbon?

a)

1s2 2p2

b)

1s2 2s2 2p2

c)

1s1 1s2 2s2 2p2

49.

1s2 2s2 is which element?

a)

Lithium

b)

Beryllium

c)

Helium

d)

Boron

50.

Iron (Fe) configuration is

a)

1s2 2s2 2p6 3s2 3p3

b)

1s2 2s2 2p6 3s2 3p6 4s2

c)

1s2 2s2 2p6 3s2 3p6 4s2 3d6

d)

1s2 2s2 2p6 3s2 3p6 4s2 4d6

51.

Which element is 1s2 2s2 2p6 3s2 3p6 4s2 3d7?

a)

Cobalt

b)

Nickel

c)

Manganese

d)

Chromium

52.

Write the configuration for Oxygen

a)

1s2 2s2 1p4

b)

2s2 2p4

c)

1s2 2s2 3p4

d)

1s2 2s2 2p4

53.

Write the configuration for Phosphorus

a)

2s2 2p6 3s2 3p3

b)

1s2 2s3 2p6 3p3

c)

1s2 2s2 2p6 3s2 3p3

d)

1s2 2s2 2p5 3s2 3p3

54.

Which element is 1s2 2s2 2p6 3s2 3p6 4s1?

a)

Sodium (Na)

b)

Lithium (Li)

c)

Potassium (K)

d)

Calcium (Ca)

55.

Choose the correct configuration for Zinc

a)

1s2 2s2 2p6 3s2 3p6 4s2 3d10

b)

1s2 2s2 2p6 3s2 3p6 4s2 3d9

c)

1s2 2s2 2p6 3s2 3p6 3s2 3d10

d)

1s2 2s2 2p6 3s2 3p6 4s2 3d8

56.

Choose the correct element for 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5

a)

Chlorine

b)

Bromine

c)

Krypton

d)

Sulfur

57.

Choose the correct configuration for Neon (Ne).

a)

1s2 2s2 2p6 3s2 3p6

b)

1s2 2s2 2p6 3s2

c)

1s2 2s2 2p6

d)

1s2 2s1 2p6

58.
What atom matches this electron configuration?
1s22s22p63s2
a)
Neon
b)
Magnesium
c)
Aluminum
d)
Potassium
59.
What atom matches this electron configuration?
1s22s22p63s23p64s23d10
a)
Zinc
b)
Copper
c)
Nickel
d)
Germanium
60.
What electron configuration matches an oxygen atom?
a)
1s22s22p63s2, 3p64s23d104p5
b)
1s22s22p4
c)
1s22s22p6
d)
1s22s22p63s23p64s23d1
61.
How many electrons can the first energy level hold?
a)
1
b)
2
c)
8
d)
0
62.

What is the electron configuration of Ag?

a)

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 4d10

b)

[Kr] 5s2 4d9

c)

1s2 2s2 2p6 3s2 3p6 4s2 4p6 5s2 4d9

d)

1s2 2s2 2p6 3s2 3p6 3d10 4s2 4d10 4p6 5d10 5s2 4d9

63.

How many valence Electrons does Copper Have?

1s2 2s2 2p6 3s2 3p6 4s2 3d9

a)

6

b)

9

c)

17

d)

2

64.
Electrons occupy orbitals of lowest energy first is part of what electron configuration rule?
a)
Hund’s Rule
b)
Aufbau Principle
c)
Pauli Exclusion Principle
65.
What is the shorthand electron configuration for Sulfur atom?
a)
[Ar] 3p4
b)
[He] 3s23p4
c)
[Ne] 3s23p4
d)
[Na] 3s23p3
66.
Electron arrangement that uses arrows
a)
Electron configuration
b)
Shorthand configuration
c)
Lewis dot structure
d)
Orbital diagram
67.
What atom matches this electron configuration?
[Xe] 6s25d9
a)
Mercury
b)
Gold
c)
Platinum
d)
Thallium
68.
An orbital can at most hold how many electrons?
a)
1 electron
b)
2 electrons
c)
3 electrons
d)
4 electrons
69.
Valence electrons are: 
a)
Electrons farthest away from the nucleus
b)
Electrons closest to the nucleus
c)
Electrons that just come and go - they don't stay with the atom
70.
Magnesium's ion
a)
Mg+
b)
Mg2+
c)
Mg-
d)
Mg2-
71.
Which element is depicted from this atomic orbital diagram?
a)
Carbon
b)
Nitrogen
c)
Oxygen
d)
Phosphorus
72.
Which element is depicted from this orbital diagram
a)
Fluorine
b)
Neon
c)
Chlorine
d)
Argon
73.
Which is associated with more energy? 
a)
2p
b)
2s
c)
3p
d)
1s
74.
What is the shape of an s orbital?
a)
sphere
b)
dumbbell
c)
double dumbbell
d)
TOO COMPLEX TO KNOW IT.
75.
How many total electrons can the f orbitals in a sublevel hold?
a)
2
b)
14
c)
6
d)
10
76.
Electrons are paired based on their spin directions, clockwise and counterclockwise, is what electron configuration rule?
a)
Hund’s Rule
b)
Aufbau Principle
c)
Pauli Exclusion Principle
77.
What is this element? 
[Ar]4s2
a)
Calcium
b)
Sodium
c)
Scandium
d)
Titanium
78.

Which orbital shows a violation of Hund's Rule?

a)

A

b)

B

c)

C

d)

D

e)

None of these

79.

Which orbital shows a violation of the Pauli Exclusion Principle?

a)

A

b)

B

c)

C

d)

D

e)

None of these

80.

Which orbital shows a violation of the Aufbau Principle?

a)

A

b)

B

c)

C

d)

D

e)

None of these

81.

What is incorrect about this orbital diagram?

a)

Both arrows in the 2p box should be pointing up

b)

Nothing

c)

One of the electrons in the first 2p box should be placed in the second 2p box, still pointing down

d)

One of the electrons in the first 2p box should be placed in the second 2p box, pointing up

82.
Which element is pictured?
a)
neon
b)
fluorine
c)
magnesium
d)
argon
83.
How many electrons can the d sublevel hold?
a)
14
b)
10
c)
2
d)
6
84.

Which type of orbital has the lowest energy?

a)

p orbital

b)

d orbital

c)

s orbital

d)

f orbital

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