Grade 9 Science: Atomic Number/Mass Number 2

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 atomic mass of this atom?

• 1

• 3

• 4

• 7

Tags

NGSS.MS-PS1-1

What is the atomic number of Barium? (enlarge the periodic table)

• 20
• 38
• 56
• 88

Tags

NGSS.MS-PS1-1

What is the atomic number of Nickel? (enlarge the periodic table)

• 110
• 28
• 46
• 78

Tags

NGSS.MS-PS1-1

How many protons are in a sodium atom? (tap to enlarge the periodic table)

• Sodium has 1 proton.
• Sodium has 3 protons.
• Sodium has 11 protons

Tags

NGSS.MS-PS1-1

An element has the mass number 12 and atomic number  6. The number of neutrons in it is:

• 6
• 10
• 4
• 8

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

• 5
• 8
• 50
• 2

Tags

NGSS.MS-PS1-1