77 — - r. F-. = : -1 h 2 c=oh + 31 HC=0 + 29 H 3 c + 15 1 00 u u 31 = 80 - n ■B 29 32 = 60 - 3 electron pairs: Linear E.g. XX XX CK B < Cl XX XX X X Semi-stable compounds can form giant covalent.

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