Atomic & Mass Number

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

What is the mass number of an atom?

Back

The mass number is the total number of protons and neutrons in the nucleus of an atom.

Front

Which subatomic particle has a positive charge?

Back

Proton.

Front

Which subatomic particle has no charge?

Back

Neutron.

Front

Which subatomic particle has a negative charge?

Back

Electron.

Front

How do you calculate the number of neutrons in an atom?

Back

Number of neutrons = Mass number - Atomic number.

Front

What is the atomic number of barium (Ba)?

Back

56.

Front

What is the mass number of nitrogen-13?

Back

7.

Front

What is the relationship between atomic number and element identity?

Back

The atomic number uniquely identifies an element.

Front

What is the charge of an electron?

Back

Negative.