Atomic Numbers, Mass Numbers, & Average Atomic Masses

Carbon has atomic number 6. This means it has _____ protons.

• 2

• 8

• 6

• 12

The whole number above an element's symbol represents what?

• Atomic Number

• Average Atomic Mass

• Number of Neutrons

• Number of Isotopes

The decimal number below an element's symbol represents what?

• Atomic Number

• Average Atomic Mass

• Number of Neutrons

• Number of Protons

As a neutral atom, which element will have exactly 29 protons?

• Cobalt

• Chromium

• Copper

• Chlorine

As a neutral atom, which element will have exactly 17 electrons?

• Cobalt

• Chromium

• Copper

• Chlorine

Tags

NGSS.HS-PS1-1

Using mass number 31, Phosphorus will have how many neutrons?

• 15

• 16

• 31

• 1

Using mass number 59, Cobalt will have how many neutrons?

• 27

• 28

• 32

• 33

The average atomic mass is a decimal because the atoms of an element will have different numbers of what?

• Protons

• Electrons

• Neutrons

• Atomic Numbers

How do you figure out the number of protons of an element?

• It is the same as the atomic number

• It is the same as the average atomic mass

• It is the same as the mass number

• It is the same as the elements on the periodic table

What formula is used to find the number of neutrons in an element?

• Atomic Number + Mass Number

• Atomic Number - Mass Number

• Mass Number + Atomic Number

• Mass Number - Atomic Number