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Isotopes and Electron Configurations

Total questions: 29

Worksheet time: 1hrs 27mins

Name
Class
Date
1.

How many neutrons are in an atom of P-29?

a)

29

b)

15

c)

14

d)

31

2.
What is the number of neutrons?
a)
34
b)
79
c)
45
d)
35
3.
If you have 10 protons and 9 neutrons, what would the mass number be?
a)
19
b)
9
c)
10
d)
1
4.
If an atom has 15 protons, which atom is it?
a)
Potassium
b)
Argon
c)
Phosphorus
d)
Palladium
5.
What do these isotopes of carbon all have in common?
a)
neutrons & mass number
b)
atomic number and neutrons
c)
atomic number and electrons
d)
protons, atomic number, and mass number
6.
What is an example of an Isotope
a)
Cu
b)
C02
c)
H2O
d)
C-14
7.
What is an isotope?
a)
A neutral atom
b)
An atom with a different number of protons
c)
An atom with a different number of neutrons
d)
An atom with a different number of electrons
8.
How many neutrons does uranium-235 have?
a)
238
b)
92
c)
146
d)
143
9.
The electron configuration of an atom is 1s22s22p6.  The number of electrons in the atom is 
a)
3
b)
6
c)
8
d)
10
10.
What atom matches this electron configuration?
1s22s22p63s23p64s23d10
a)
Zinc
b)
Copper
c)
Nickel
d)
Germanium
11.
What is the noble gas shorthand electron for Sulfur atom?
a)
[Ar] 3p4
b)
[He] 3s23p4
c)
[Ne] 3s23p4
d)
[Na] 3s23p4
12.
What atom matches this electron configuration?
[Xe] 6s25d9
a)
Mercury
b)
Gold
c)
Platinum
d)
Thallium
13.

Identify the Electron Configuration for Aluminum (Al)

a)

1s2 2s2 2p6 3s2 3p1

b)

1s2 2s2 2p6 3s2 3p3

c)

1s2 2s2 2p6 3s2 4p1

14.
Which electron configuration belongs to Chlorine (Cl)?
a)
1s2 2s2 2p6 3s2 3p5
b)
1s2 2s2 2p6 3s2 3p6
c)
1s2 2s2 2p6 3s2 3p7
15.
Which of the following elements is a noble gas?
a)
1s2 2s2
b)
1s2 2s2 2p5
c)
1s2 2s2 2p6 3s2 3p6
d)
1s2 2s2 2p6 3s1
16.

How many electrons can the d sublevel (the d orbitals) hold?

a)

14

b)

10

c)

2

d)

6

17.

Choose the Noble Gas that you would use to begin the shorthand configuration of the following element: Iron

I

a)

[He]

b)

[Ne]

c)

[Ar]

d)

[Kr]

18.

Choose the Noble Gas that you would use to begin the shorthand configuration of the following element.

Plutonium (Pu)

a)

[Xe]

b)

[Ne]

c)

[Rn]

d)

[Kr]

19.
How many electrons can the s sublevel hold?
a)
14
b)
10
c)
2
d)
6
20.

Use the orbital filling sequence and determine what comes after 6d?

a)

7s

b)

6f

c)

6s

d)

7p

21.

How would you write the isotope name from this nuclide symbol?

a)

Sodium-23

b)

Sodium-11

c)

Sodium-12

d)

Sodium-22

22.

How many neutrons are in the isotope of sulfur,36S?

a)

16

b)

20

c)

24

d)

26

23.

Which of the following does NOT differ in isotopes of the same element?

a)

mass number

b)

number of neutrons

c)

number of protons

d)

chemical properties

24.
What is the name of the pictured isotope?
a)
Chlorine-Schmorine
b)
Chlorine-17
c)
Chlorine-35
d)
Chlorine-18
25.
What is the mass number of this atom?
a)
1
b)
3
c)
4
d)
7
26.

Which of these determines the identity of an atom?

a)

proton

b)

neutron

c)

valence electron

d)

protons and neutrons

27.

How many electrons are in a neutral atom of the isotope fluorine-20?

a)

20

b)

9

c)

19

d)

18

28.

What is the name of the isotope with 54 protons and 79 neutrons?

a)

Xenon-79

b)

Gold-79

c)

Gold-133

d)

Xenon-133

29.

Each row on the periodic table represents:

a)

an energy level

b)

a sublevel

c)

an electron

d)

an orbital

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