Problem: What is the valence-shell electron configuration for the shaded group in the periodic table given below? a) ns2(n-2)f2  b) ns4  c) ns2(n-1)d2  d) ns2np2 e) ns2nd2

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What is the valence-shell electron configuration for the shaded group in the periodic table given below?

a) ns2(n-2)f

b) ns

c) ns2(n-1)d

d) ns2np2

e) ns2nd2

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