The valency of V, VI, VII groups respectively are………………
The valency of V, VI, VII groups respectively are………………
A) 1, 2, 3
B) 3, 2,1
C) 0,1,2
D) 1, 2,4
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The valency of V, VI, VII groups respectively are………………
A) 1, 2, 3
B) 3, 2,1
C) 0,1,2
D) 1, 2,4