Question

A. 1s2s2 2p
B.1s2
C.1s 2s 2p 3s?
D.1s 2s22p6
From this information, answer the following questions.
(i) Which elements are in the same period?
(ii) Which elements are in the same group?
(iii) Which are inert gases?
(iv) To which group and period does the element 'A" belongs?
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Answer 1

I don't know sorry sorry