2.4 Atomic Mass Units and Calculating Atomic Mass

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

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

• 20

• 38

• 56

• 88

Tags

NGSS.MS-PS1-1

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

• Sodium has 1 proton.

• Sodium has 3 protons.

• Sodium has 11 protons

Tags

NGSS.MS-PS1-1

Atoms of the same element which have a different number of neutrons are called _________________.

• ions

• isotopes

• quarks

• molecules

Which subatomic particle has a negative charge in the atom?

• proton

• neutron

• electron

• quark

Tags

NGSS.MS-PS1-1

How many neutrons does C-14 contain? (tap to enlarge the image)

• 6

• 7

• 14

• 8

Tags

NGSS.MS-PS1-1

How many neutrons does an atom of the isotope Neon-22 have? (tap to enlarge the image)

• 12

• 10

• 22

• 20

Tags

NGSS.MS-PS1-1