• 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