Geology

Electrons that interact with other atoms to form chemical bonds

Located in outer most shell

number of protons and number of neutrons

differs among isotopes of an element

charged ion - too many or too few electrons than protons

positively charged ion

Negatively charged ions

Number of protons in nucleus

fixed for every element

varient forms of an atom that differ with respect to number of neutrons in nucleus

EX. oxygen - two fairly common isotopes

Oxy 16 and Oxy 18

bond between ions held by electrical charge

bond between atoms sharing an electron

"shared pair"

strongest of the two bonds

Naturally occurring, generally inorganic solid with definable composition and a fixed crystalline structure