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Molecular geometry, electron geometry, covalent bonds: N-A equals S equation

The equation below is used for Covalent Bonds, Molecular geometry, electron geometry, and structural formulas to figure the number of bonds in a molecule.

N-A = S equation to figure the number of bonds in a molecule

N = needed: the sum of the number of valence electrons needed by each atom (2 for hydrogen, 8 for all other atoms)

A = available: the sum of the number of valence electrons available for each atom

S = shared: the number of electrons shared in the molecule

S/2 = the number of covalent bonds in the molecule

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Thank you very much,
John M.