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An atoms central region which is made of of protons and neutrons


A subatomic partial that has a positive charge and is found in the nucleus of the atom


A subatomic particle that has a neutral charge and is found in the nucleus of the atom


A subatomic particle that has a negative charge and is found orbiting the atom


A region in an atom where there is a high probability of finding electrons


An electron that is found in the outermost shell of an atom and that determines the atom's chemical properties

Valence Electrons

A law that states the repeating chemical and physical properties of an element change periodically with the atomic numbers of the element

Periodic Law

A horizontal row of elements in the periodic table


A vertical column of elements in the periodic table

Group (Family)

An atom or group of atoms that has lost or gained one or more electrons and as a negative or positive charge


The number of protons in the nucleus of an atom

Atomic Number

The sum of the numbers of protons and neutrons in the nucleus of an atom

Mass Number

An atom that has the same number of protons as other atoms of the same element do but has a different number of neutrons


A unit of mass that describes the mass of an atom or molecule

Atomic Mass Unit (amu)

The weighted average of the masses of all naturally occurring isotopes of an element

Average Atomic Mass Unit

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