Atomic Number and Atomic Mass

What is the mass number defined as?

• the number of protons
• the number of protons and neutrons
• the number of neutrons
• the number of protons and electrons

What is the atomic number?

• the number of protons

• the number of protons and neutrons

• the number of neutrons

• the number of protons and electrons

Tags

NGSS.MS-PS1-1

What is the atomic number of this atom?

• 1
• 3
• 4
• 7

Tags

NGSS.MS-PS1-1

The fluorine atom has an atomic number of

• 19

• 9

Tags

NGSS.MS-PS1-1

What is the mass number and atomic number ?

• Mass number = 7, atomic number = 14

• Mass number = 14, atomic number = 7

Tags

NGSS.MS-PS1-1

Which particle has a positive charge?

• electron
• orbital
• proton
• neutron

Choose the particle that has no charge.

• nucleus
• neutron
• proton
• electron

How many electrons are there in one atom of magnesium?

• 12

• 6

• 24

Tags

NGSS.MS-PS1-1

What is the number of protons in Magnesium atom ?

• 12

• 24

• 23

• 8

Tags

NGSS.MS-PS1-1

What is the number of electrons in chlorine atom ?

• 35

• 11

• 18

• 17

Tags

NGSS.MS-PS1-1