callister7e sm ch02 21

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2-23 
 2.21 For silicon, having the valence electron structure 3s23p2, N' = 4; thus, there are 8 – N' = 4 covalent 
bonds per atom. 
 For bromine, having the valence electron structure 4s24p5, N' = 7; thus, there is 8 – N' = 1 covalent bond 
per atom. 
 For nitrogen, having the valence electron structure 2s22p3, N' = 5; thus, there are 8 – N' = 3 covalent 
bonds per atom. 
 For sulfur, having the valence electron structure 3s23p4, N' = 6; thus, there are 8 – N' = 2 covalent bonds 
per atom. 
 For neon, having the valence electron structure 2s22p6, N’ = 8; thus, there are 8 – N' = 0 covalent bonds 
per atom, which is what we would expect since neon is an inert gas. 
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