Periodic Table

Front

atomic number

Back

the number of protons in the nucleus of an atom

Front

period

Back

A horizontal row of elements in the periodic table

Front

Found in group one of the periodic table; highly reactive

Back

alkali metals (group 1)

Front

neutron

Back

A small particle in the nucleus of the atom, with no electrical charge

Front

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

Back

Proton

Front

A subatomic particle that has a negative charge

Back

electrons

Front

not able to conduct heat or electricity, little to no metallic luster

Back

Non-metals

Front

Found in group two of the periodic table; highly reactive

Back

Alkali Earth Metals (Group 2)

Front

The electrons in the outermost shell (main energy level) of an atom; these are the electrons involved in forming bonds.

Back

valence electrons

Front

Halogens (Group 17)

Back

most reactive nonmetals