Protons, Neutrons, and Electrons

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What are protons?

Back

Protons are positively charged particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutrons are neutral particles found in the nucleus of an atom, with no charge.

Front

What are electrons?

Back

Electrons are negatively charged particles that orbit the nucleus of an atom.

Front

What is the atomic number?

Back

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

Front

How do you find the number of electrons in a neutral atom?

Back

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

Front

What is atomic mass?

Back

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

Front

What is the relationship between atomic number and element identity?

Back

The atomic number uniquely identifies an element; each element has a different atomic number.

Front

What is the atomic mass of Calcium?

Back

The atomic mass of Calcium is approximately 40.08 amu.

Front

How many protons are in Sodium?

Back

Sodium has 11 protons.