Average Atomic Mass

The atomic mass of an element is the ___.

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

• weighted 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

The atomic mass of an element depends upon the ___.

• relative abundance of protons in that element

• mass and relative abundance of each isotope of that element

• mass of each isotope of that element

• mass of each electron in that element

Which of the following is necessary to calculate the atomic mass of an element?

• the atomic mass of carbon-12

• the atomic number of the element

• the relative masses of the element's protons and neutrons

• the masses of each isotope of the element

Chlorine has two naturally occurring isotopes, Cl-35 and Cl-37, The atomic mass of chlorine is 35.45. Which of these two isotopes of chlorine is more abundant?

• Cl-35

• Cl-37

• Cannot be determined from the information provided.

The box for an element from the periodic table is shown. Which is the atomic mass?

• A

• B

• C

• D

The box for an element from the periodic table is shown. Which is the atomic number?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-1

What does the 1.0079 stand for?

• atomic number

• hydrogen

• atomic mass

• mass number

Tags

NGSS.HS-PS1-1

Magnesium exists as the three isotopes shown. What is the average atomic mass of magnesium?

• 20.74 amu

• 22.56 amu

• 18.39 amu

• 24.31

Tags

NGSS.MS-PS1-1