QuestionPeriodic table / blocks
Which one of the following is the correct outermost electronic configuration of representative elements?
- (a) (n-1)d¹⁻¹⁰ ns⁰⁻²
- (b) ns¹⁻² to ns²np¹⁻⁶
- (c) (n-2)f¹⁻¹⁴ (n-1)d⁰⁻¹ ns²
- (d) ns⁰
Answer: (b) ns¹⁻² to ns²np¹⁻⁶
Representative (main-group) elements = s- and p-block: outer configuration ns¹⁻² (s-block) to ns² np¹⁻⁶ (p-block) → (b). (a) is d-block, (c) f-block.