Mass Number & Atomic Number

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

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 of this atom?

• 1
• 3
• 4
• 7

Tags

NGSS.MS-PS1-1

What is the mass number of this atom?

• 1

• 3

• 4

• 7

Tags

NGSS.MS-PS1-1

How many electrons are in an atom with an atomic number of 50?

• 5

• 25

• 50

• 100

Tags

NGSS.MS-PS1-1

If an atom has 10 electrons, how many protons does it have?

• 0

• 1

• 10

• 5

Tags

NGSS.MS-PS1-1

How many neutrons does this lithium atom have?

• 8

• 3

• 4

• 5

Tags

NGSS.MS-PS1-1

The fluorine atom has a mass number of

• 19

• 9

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