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Periodic Classification of Elements — Science STD 10 — Question

Tamilnadu BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements1 Mark
Question
Elements a, b, c and d have the following electronic configurations
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Answer

(a) $I s^2 2 s^2 2 p^6$
(b) $I s^2, 2 s^2, 2 p^6, 3 s^2, 3 p^1$
(c) $1 s^2, 2 s^2, 2 p^6, 3 s^2, 3 p^6$
(d) $I s^2, 2 s^2, I p^1$

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