78. Electronic configuration of A and B elements are (2, 8, 8, 1) and (2, 7) respectively. The periods of these elements are a) 1st and 7th Period b) 2nd and 4th Period c) 4th and 2nd Period d) 2nd and 7th Period
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Answer:
4th and 2nd period
Explanation:
Period depends on the number of zones a particular element has.
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c) 4th and 2nd period
Explanation:
electronic configuration of 1st element is (2,8,8,1).=potassium(K)
electronic configuration of 2nd element is (2,7) =fluorine(F)
1st element lies in 4th period
2nd element lies in 2nd period
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