Diatomic molecule - a molecule comprised of two atoms, of the same element, Central atom - the atom in the centre of the molecule, the atom the other atoms are attached to, Lone pairs - valence electron pairs not bonded to another atom, Octet rule - an atoms desire to have a full valence shell of 8 electrons, Lewis structures - drawing showing valence electrons and bonding of molecules, VSEPR - Valence Shell Electron Pair Repulsion, A covalent bond - A shared pair of electrons, A solid line - Represents a bond in the plane of the paper, A solid wedge - Represents a bond coming out of the plane of the paper, A dotted wedge - Represents a bond going into the plane of the paper, Polyatomic ions - Ions with more than one atom, minimise repulsion - Electron pairs are arranged to, bonding region - Each multiple bond is treated as a , Bonded pair/bonded pair - Lowest repulsion experienced between this, Lone pair/lone pair - Maximum repulsion experienced between this, A dative covalent bond - Formed when one atom provides both of the shared electrons,

Electron repulsion theory

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