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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