grade 9 electron configuration

The maximum number of electrons that can occupy the 2nd shell (energy level) of an atom is

• 2

• 8

• 10

• 18

What group does the atom shown belong to?

• 1

• 2

• 8

• 12

The electron configuration for the atom shown would be written as

• 4, 2

• 6

• 2, 4

• 2, 1, 2, 1

What period does the atom shown belong to?

• 4

• 3

• 2

• 1

How many valence electrons does a chlorine atom have?

• 35

• 18

• 17

• 7