Investigation 2 Vocabulary

Front

The basic unit of a chemical element

Back

atom

Front

Number of protons in an atom

Back

atomic number

Front

A measure of the size of an atom of an element from the nucleus to the outer electron

Back

atomic radius

Front

Weighted average of the atomic masses for the isotopes of an element

Back

average atomic mass

Front

A group of elements with similar chemical properties

Back

chemical family

Front

A subatomic particle whose electric charge is negative

Back

electron

Front

A chemical property that describes the extent to which an atom attracts electrons towards itself; cannot be directly measured

Back

electronegativity

Front

Have the same number of valence electrons and similar chemical properties

Back

families

Front

A measure of the size of an ion of an element in a crystal (usually measured by taking half the distance between two nuclei)

Back

ionic radius

Front

A chemical property that describes the amount of energy required to remove an electron from an atom

Back

ionization energy