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Which of the following two elements belo...

Which of the following two elements belong i) the same group ii) same period in the periodic table `._(4)Be,_(3)Li,_(12)Mg,_(35)Br`

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Principal quantum number of outermost electron in Be and L is 2. Hence both Be and Li belong to the same period i.e., `2^(nd)` period . Be and Mg have the same number of outermost electrons , i.e., 2. Hence both Be and Mg belong to the same group in the periodic table.
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SUBHASH PUBLICATION-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES -TWO marks questions and answers
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