Quiz Review: Isotopes and Average Atomic Mass

How many neutrons does the isotope of lithium have?

• 8
• 3
• 5

Tags

NGSS.MS-PS1-1

If a hydrogen atom has 1 proton, 1 electron, and 1 neutron, its atomic number is:

• 1
• 2
• 3

Tags

NGSS.MS-PS1-1

How many protons does this isotope of titanium have?

• 48
• 22
• 26

Tags

NGSS.MS-PS1-1

If a sulfur atom has 16 protons, 16 electrons, and 16 neutrons, its atomic mass is:

• 16
• 32
• 48

Tags

NGSS.MS-PS1-1

How many neutrons does an Oxygen-19 isotope have?

• 19

• 8

• 11

• 10

Atomic number=

• number of neutrons

• atomic mass

• number of protons

• electrons+protons

Mass Number is--

• the number of protons + neutrons
• the number of protons
• the number of electrons +protons +electrons
• the same as atomic number

The top number in this isotope notation is

• the mass number
• the atomic number
• the atomic mass
• the neutron number

Tags

NGSS.HS-PS1-8

The bottom number in this isotope notation is

• the mass number
• the atomic number
• the atomic mass
• the neutron number

Tags

NGSS.MS-PS1-1

24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?

• 74.92 amu
• 24.97 amu
• 75.01 amu
• 74.51 amu