Compound: two or more different elements combined together chemically
Octet Rule: when bonding occurs, atoms tend to reach an electron arrangement with 8 electrons in the outermost energy level
Ion: a charged atom or group of atoms
Ionic bonding: the force of attraction between oppositely charged ions in a compound. Formed by the complete transfer of an electron from one atom to another
molecule: a group of atoms joined together, the smallest particle of an element with can exist independently
valency: the number of atoms of hydrogen (or any monovalent element) with which each atom of the element combines
Transition metals have variable valency, they can lose different numbers of electrons
covalent bonding is when electrons are shared, not transferred like ionic bonding
a single bond is when one pair of electrons is shared, double = 2 pairs, triple = 3 pairs
