Unit 1: Atoms + Periodic Table Vocabulary

Front

Elements

Back

Substances that consist of only one type of atom and cannot be broken down into simpler substances by chemical means.

Front

Atoms

Back

The basic unit of a chemical element, consisting of a nucleus surrounded by electrons.

Front

Protons

Back

Positively charged particles found in the nucleus of an atom.

Front

Neutrons

Back

Neutral particles found in the nucleus of an atom, having no charge.

Front

Electrons

Back

Negatively charged particles that orbit the nucleus of an atom.

Front

Nucleus

Back

The central part of an atom, containing protons and neutrons.

Front

Atomic Number

Back

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

Front

Mass Number

Back

The total number of protons and neutrons in an atom's nucleus.

Front

Group/Family

Back

A column of elements in the periodic table that share similar chemical properties.

Front

Period

Back

A row of elements in the periodic table