Atomic Mass, Atomic Number and Isotope

The average atomic mass of an element is the ___.

• average of the mass number and the atomic number for the element

• average of the masses of the isotopes of the element

• total mass of the isotopes of the element

• total number of subatomic particles in the nucleus

What does the atomic number tell us? (select all correct answers)

• the number of protons

• the number of protons and electrons

• the number of protons and neutrons

• the number of neutrons

What does the mass number tell us?
(a)  

• the number of protons and neutrons

• the number of protons

• the number of neutrons

• the number of protons and electrons

What is the atomic number of this atom?

Mathematical Equivalence

ON

Tags

NGSS.MS-PS1-1

What is the mass number of this atom?

• 1

• 3

• 4

• 7

Tags

NGSS.MS-PS1-1

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

Mathematical Equivalence

ON

which atom has  4 neutrons?

• Li-6

• Li-7

• Li-8

• they have the same # of neutrons

Tags

NGSS.MS-PS1-1

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

Mathematical Equivalence

ON

What is the atomic mass of Neon?

• 10

• 30

• 10.18

• 20.18

Tags

NGSS.MS-PS1-1

The atomic number of this pictured element is

• 28

• 58.6934

• Ni

• Nickel

Tags

NGSS.MS-PS1-1