Atomic Number and Atomic Mass

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is atomic mass?

Back

Atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu).

Tags

NGSS.HS-PS1-7

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 particle has a positive charge?

Back

Proton.

Front

Which particle has a negative charge?

Back

Electron.

Front

Which particle has no charge?

Back

Neutron.

Front

How do you calculate the mass number?

Back

Mass number = Number of protons + Number of neutrons.

Front

Can atomic mass be rounded?

Back

Yes, atomic mass can be rounded to the nearest whole number.

Front

What determines the identity of an element?

Back

The atomic number determines the identity of an element.

Front

What is the relationship between protons and electrons in a neutral atom?

Back

In a neutral atom, the number of protons equals the number of electrons.