Free Printable Electron Configuration Basics

1.

Which element has the electron configuration $[Ne] 3s^2 3p^1$ ?

a)

Magnesium

b)

Aluminum

c)

Silicon

d)

Phosphorus

2.

Which of the following elements has the electron configuration $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^1$ ?

a)

Gallium

b)

Germanium

c)

Arsenic

d)

Zinc

3.

When an atom loses an electron, it becomes a:

a)

positive ion

b)

negative ion

c)

neutral ion

d)

neutral atom

4.

When an atom gains an electron, it becomes a:

a)

positive ion

b)

negative ion

c)

neutral ion

d)

neutral atom

5.

According the "Octet rule", how many valence electrons does an atom need to have a stable electron configuration?

a)

1

b)

5

c)

8

d)

10

6.

Which group in the periodic table has elements with a stable electron structure? (Full outer shell)

a)

Group 1

b)

Group 2

c)

Group 14

d)

Group 18 (Noble Gases)

7.

How does Lithium become an ion?

a)

Lose 1 electron

b)

Gain 7 electrons

c)

Lose 3 electrons

d)

Gain 1 electron

8.

How does Fluorine become an ion?

a)

Gain 1 electron

b)

Lose 1 electron

c)

Lose 7 electrons

d)

Lose 2 electrons

9.

H and He are exceptions to the Octet Rule. How many electrons can they have in their outer shell?

a)

1

b)

2

c)

8

d)

10

10.

What electron configuration matches an oxygen atom?

a)

1s²2s²2p⁶3s2, 3p⁶4s²3d¹⁰4p⁵

b)

1s²2s²2p⁴

c)

1s²2s²2p⁶

d)

1s²2s²2p⁶3s²3p⁶4s²3d¹

11.

Identify the Electron Configuration for Aluminum (Al)

a)

1s²2s²2p⁶3s²3p¹

b)

1s²2s²2p⁶3s²3p³

c)

1s²2s²2p⁶3s²4p¹

12.

Which element has a configuration of 1s2 2s2 2p6?

a)

Neon

b)

Helium

c)

Argon

d)

Krypton

13.

What is the electron configuration of a chlorine atom?

a)

$1s^2 2s^2 2p^6 3s^2 3p^5$

b)

$1s^2 2s^2 2p^6 3s^2 3p^6$

c)

$1s^2 2s^2 2p^6 3s^2 3p^4$

d)

$1s^2 2s^2 2p^6 3s^2 3p^3$

14.

Which of the following elements has the electron configuration $[Ar] 4s^2 3d^{10} 4p^5$ ?

a)

Bromine

b)

Krypton

c)

Chlorine

d)

Iodine

15.

How many unpaired electrons are present in the ground state electron configuration of oxygen?

a)

0

b)

1

c)

2

d)

4

Electron Configuration Basics

Total questions: 15

Worksheet time: 15mins

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