Metals: Beryllium, Magnesium, Calcium, Strontium, Barium, Radium, Covalent Networks: Boron, Carbon, Silicon, Diatomic Covalent Molecules: Fluorine, Chlorine, Bromine, Iodine, Hydrogen, Nitrogen, Oxygen, Single atoms: Helium, Neon, Argon, Krypton, Xenon,

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