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#24 Electrons Unit Review

Total questions: 42

Worksheet time: 27mins

Name
Class
Date
1.

In 1s2, the 1 means

a)

there is 1 electron

b)

the electrons are in the 1st energy level

c)

the shape is circular

d)

there is a -1 charge

2.

What is the electron configuration for Lithium?

a)

1s22s1

b)

3

c)

-3

d)

Li

3.

True or False: Electrons occupy the lowest energy level first

a)

True

b)

False

4.

According to the Pauli Exclusion Principle, each orbital can accept __ electron/s

a)

1

b)

2

c)

2, 8, 18

d)

2, 8, 8

5.

True or false: In an orbital, electrons must have the same spin.

a)

True

b)

False

6.

Each box on the electron configuration worksheet represents an orbital. An orbital can only hold __ electron(s)

a)

1

b)

2

c)

depends on the level

d)

8

7.

Orbits of equal energy are occupied one at a time before doubling up

a)

True

b)

False

8.

Electrons fill in level with same spin first, then opposite spin

a)

True

b)

False

9.

Electrons occupy the lowest energy levels first

a)

True

b)

False

10.

There are __ energy levels

a)

1

b)

2

c)

7

d)

8

11.
How are electrons arranged in an atom?
a)
In groups of five
b)
In energy levels
c)
By color
d)
By shape
12.
What's a valence electron?
a)
electrons in the second energy level
b)
electrons in the outermost energy level
c)
the atomic number
d)
electrons in the first level
13.
How many electrons should Flourine have around its Lewis dot model?
a)
5
b)
6
c)
7
d)
8
14.
How many valence electrons does magnesium have?
a)
1
b)
2
c)
12
d)
24
15.
How many electrons are in the outer shell of Sodium?
a)
1
b)
8
c)
2
16.

What is it called when electrons absorb energy and move to an orbital with higher energy.

a)

Ground state

b)

Excited state

c)

Absorption rate

d)

Quantum

17.

What is the lowest available energy state of an atom?

a)

Ground state

b)

Excited state

c)

Absorption rate

d)

Quantum

18.

What are the regions where there is a high probability of finding an electron called?

a)

Clouds

b)

Rings

c)

Orbitals

d)

Configuration

19.
What electron configuration matches an oxygen atom?
a)
1s22s22p63s2, 3p64s23d104p5
b)
1s22s22p4
c)
1s22s22p6
d)
1s22s22p63s23p64s23d1
20.
How many electrons does Si contain? (click to see image)
a)
14
b)
28
c)
2
d)
4
21.
The electron configuration of an atom is 1s22s22p6.  The number of electrons in the atom is 
a)
3
b)
6
c)
8
d)
10
22.
What do you start electron configuration with?
a)
1s2
b)
1d10
c)
1f14
d)
1p6
23.
What is this element?
1s22s22p63s2
a)
Neon
b)
Magnesium
c)
Aluminum
d)
Potassium
24.
How many valence Electrons does Copper Have?
1s2 2s2 2p6 3s2 3p6 4s2 3d9
a)
2
b)
9
c)
17 
d)
2
25.
What is this element? 
1s22s22p63s23p6
4s23d104p6
a)
Argon
b)
Krypton
c)
Selenium
d)
Bromide
26.
How many electrons can the d sublevel hold?
a)
8
b)
10
c)
2
d)
4
27.
The electrons in an atom's outermost orbitals; determines the chemical properties of an element.
a)
photon
b)
quantum
c)
valence electron
d)
electron dot structure
28.
In a stable atom the amount of electrons is electron is equal to
a)
neutrons
b)
protons
c)
atomic mass
d)
neutrons + protons
29.
In a stable atom, the atomic number is equal to...
a)
neutrons
b)
electrons
c)
atomic mass
d)
what is a stable atom?
30.
Which of the following best describes an electron?
a)
It has no charge and about the same mass as a proton
b)
It has a negative charge and much less mass than a proton
c)
It has a positive charge and much more mass than a neutron
d)
It has a negative charge and about the same mass as a neutron
31.
Which of the following elements has 18 electrons?
a)
Flourine
b)
Helium
c)
Argon
d)
Chlorine
32.
Which is associated with more energy? 
a)
2p
b)
2s
c)
3p
d)
1s
33.
Waves with a large wavelength have a __________ frequency
a)
high
b)
low
34.
Which is a particle of electromagnetic radiation with no mass that carries a quantum of energy?
a)
electron 
b)
neutron 
c)
microwave
d)
photon 
35.
Bromine is found in which block?
a)
s
b)
p
c)
d
d)
f
36.
What atom matches this electron configuration?
1s22s22p63s23p64s23d10
a)
Zinc
b)
Copper
c)
Nickel
d)
Germanium
37.
What electron configuration matches an oxygen atom?
a)
1s22s22p63s2, 3p64s23d104p5
b)
1s22s22p4
c)
1s22s22p6
d)
1s22s22p63s23p64s23d1
38.

Elements in group 7A (group 17) have _____ valence electrons.

a)

7

b)

8

c)

17

d)

cant be determined

39.

Which element has only one valence electron?

a)

C

b)

Ar

c)

K

d)

Sr

40.

Which element does not have 8 valence electrons?

a)

He

b)

Ne

c)

Ar

d)

Rn

41.

What is the “dual nature” of light?

a)

Light behaves like a photon and an electron.

b)

Light behaves like a particle and a photon.

c)

Light has properties of a wave and a particle.

42.

How many electrons can be contained in each of the following sublevels: s, p, d, and f?

a)

s=1, p=6, d=5, f=14

b)

s=2, p=6, d=10, f=14

c)

s=1, p=3, d=5, f=7

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