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CH3 is usually an ion, typicaly a cation, or positive ion s.t. the formula is written as CH3+, this form takes a trigonal planar geometry, such as in certain substitution and elimination reactions. If it were to be the more rare anion, or Negativ Ion, CH3-, the extra electron pair would occupy an orbital and create a trigonal pyramidal geometry, as though the atom were sp3 hybridized. It should be noted this is more of a theoretical form, as the anion form is rare at best.

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16y ago

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