Which element has three shells with 2 valence electrons
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Answer:
Mg
Explanation:
It has three shells with 2 valence electrons.
No. of shells denote principle quantum no. which in turn denotes the period number to which the element belongs. In this case it is three, thus element must be of third period.
Starting from the right, we come to know that Mg has two valence electrons in its N (outermost) shell, the inner ones being completely filled, that is with 2 (in K) and 8 (in L) electrons respectively.
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