simple biology

Atom

smallest unit of matter

charge of atoms in nucleus

positive

Protons

in the nucleus and it is positive

elctrons

negative charge, electron cloud/outer layers

atomic number

number of protons in nucleus

compound

atoms of different elements chemically bonded together

ionic bond

electrons that are transferred from one atom to another atom. also is metal and non metal

covalent bond

electrons that are shared with two or more nonmetals

mass number

the total number of protons and neutrons in an atom

element

a pure substance made up of one kind of atom

molecule

a group of atoms that are help together with chemical bonds

isotope

atoms of the same element with different number of neutrons

charge

protons minus electrons

octet rule

8 valence electrons

valence number

(row number) electrons on the outmost energy level