8th Grade Unit 2 Vocabulary

Front

the smallest particle of matter

Back

Atom

Front

A subatomic particle found in the nucleus of every atom, carrying a positive charge.

Back

Proton

Front

A subatomic particle found in the nucleus of atoms that is neutral, meaning it has no charge.

Back

Neutron

Front

A subatomic particle with a negative charge, found in all atoms. that flies around the nucleus.

Back

Electron

Front

The center of an atom, containing protons and neutrons

Back

Nucleus

Front

A scientific theory stating that all matter is composed of atoms.

Back

Atomic Theory

Front

A pure substance that is made up of one type of atom.

Back

Element

Front

A chart arranging all the pure substances on planet Earth.

Back

Periodic Table

Front

Vertical columns in the periodic table that contain elements with similar chemical properties.

Back

Groups

Front

Horizontal rows in the periodic table, where elements or organized by number of protons.

Back

Periods