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atomic mass

total mass of the protons and neutrons in an atom, measured in atomic mass units

periodic table

A table that shows the elements, their atomic number, symbol, and average atomic mass; elements with similar chemical properties are grouped together.

atomic number

The number of protons in the nucleus of an atom.


a horizontal row of elements in the periodic table

group or family

vertical column on the Periodic Table; tells the number of valence electrons for an element


the ability of a substance to go through a chemical change


not chemically reactive


a characteristic of a substance that can be observed

chemical property

The ability of a substance to combine with and change into one or more new substances.

physical property

a characteristic that can be observed or measured without changing the identity of the substance

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