Basic Chemistry Concepts

Front

Atom

Back

The smallest unit of matter

Front

Atomic Theory

Back

Theory that all matter is made up of tiny indivisible particles called atoms

Front

Electron

Back

A subatomic particle that has a negative charge and negligible mass

Front

Nucleus

Back

The center of the atom containing protons and neutrons

Front

Proton

Back

A subatomic particle that has a positive charge and a mass of 1 atomic mass unit

Front

Neutron

Back

A subatomic particle that has a neutral charge and a mass of 1 atomic mass unit

Front

Atomic Number

Back

Represents the number of protons in the nucleus of the atom

Front

Atomic Mass

Back

The average mass of all of the subatomic particles in the atom

Front

Isotope

Back

A variation of the same element with a different number of neutrons in the nucleus

Front

Ion

Back

An atom that has gained or lost one or more electrons