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Per NCERT §3.7.2(a) (valence), the VALENCE of representative (s + p block) elements equals which of the following?
AAlways equal to group number minus 10
BThe number of valence electrons OR (8 − number of valence electrons)
CAlways equal to atomic number
DAlways 4
Answer & Solution
Correct answer: B. The number of valence electrons OR (8 − number of valence electrons)
Per NCERT §3.7.2(a), valence of representative element = #valence e⁻ OR 8 − #valence e⁻. e.g. Group 16 valence = 2 (= 8−6) for hydrides H₂O.
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