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H2CO. 10pts Best Answer?

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How many valence electrons in H2CO? How many electron pairs?

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  1. 12 valence electrons.

    To predict arrangement of atoms within the molecule

    Find the total number of valence electrons by adding up group numbers of the elements. For anions, add the appropriate number of electrons, and for cations, subtract the appropriate number of electrons. Divide by 2 to get the number of electron pairs.

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