Atomic mass and number and electron configuration

What is the electron configuration of this atom?

• 8,2,0

• 10,0

• 2,8

• 20,2,8

Lithium has 3 protons, 4 neutrons and 3 electrons.

What is it's atomic mass?

• 7

• 10

• 3

• 4

Boron has 5 protons, 6 neutrons and 5 electrons.

What is Boron's atomic number?

• 5

• 6

• 11

• 16

Calcium has an atomic number of 20 and an atomic mass of 40.

How many protons does calcium have?

• 40

• 20

• 2

• 10

Calcium has an atomic number of 20 and an atomic mass of 40.

How many neutrons does calcium have?

• 30

• 2

• 20

• 40

This is the correct electron configuration for Lithium.

• True

• False

This is the correct electron configuration for Sodium.

• True

• False

This is the correct electron configuration for Calcium.

• True

• False

The atomic number is...

• The number of protons and neutrons in an atom.

• The number of protons in an atom.

• The number of neutrons in an atom.

• The total mass of an atom.

Atomic mass is...

• The relative total mass of an atom, equal to the number of neutrons and protons in an atom.

• The number of electrons in an atom.

• The number of protons in an atom.

• The number of neutrons in an atom.