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Which set lists representative elements (s-block and p-block) only?
ACe, Pr, Nd, Pm
BFe, Co, Ni, Cu, Zn
CNa, Mg, Al, Si, P, S, Cl
DSc, Ti, V, Cr, Mn
Answer & Solution
Correct answer: C. Na, Mg, Al, Si, P, S, Cl
1. Representative elements are in the s and p blocks (groups 1, 2 and 13-18).
2. Na, Mg are in Group 1 and 2 (s-block).
3. Al, Si, P, S, Cl are in the p-block of period 3.
4. Fe, Co, Ni etc. are transition (d-block) elements.
5. Ce, Pr etc. are inner transition (f-block) elements.
6. So only option A lists representative elements.
_Source: NCERT Class 10 Science Ch 5 'Periodic Classification of Elements'_
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