Pentatomic (true halogens)
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Methane (methyl hydride)
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Fluoromethane (methyl fluoride)
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Chloromethane (methyl chloride)
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Bromomethane (methyl bromide)
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Iodomethane (methyl iodide)
Hexatomic
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Acetonitrile (methyl cyanide)
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Isocyanomethane (methyl isocyanide)
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Methanol (methyl hydroxide)
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Methanethiol (methyl hydrosulfide)
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Methaneselenol (methyl hydroselenide)
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Methanetellurol (methyl hydrotelluride)