It's a black fly in your acetate. It's a Fluorocarbon. It's acid rain on your wedding cake. It's the covalent bonds that are so hard to break. It's Sodium Chloride that did not precipitate.
Some element is number sixty five.
It's not a halogen, but a Lanthanide. It is found naturally as a white oxide. When you think entropy's okay and enthalpy's going right. Well lead has a funny way of protecting you when You think an x-ray's gone wrong and everything blows up in you face. No catalyst increased the reaction rate.