Which element has 2 valence electrons and is in period 4 ?

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Solution

Answer
Calcium
Explanation :
See Periodic table. Match row and column. Row for Period and column for valence electron. Means Calcium is an element which lies at Period 4 in Periodic table and having two valence electrons (Period 4 means 4th shell being occupied having 2 electrons in 4th or outermost shell)

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