(a) What is the number of valence electrons in the atoms of first element in a period ?

(b) What is the usual number of valence electrons in the atoms of the last element in a period ?

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1 Answers

The number of valence electrons in the atoms of first element in a period is- 

(a) 1

The usual number of valence electrons in the atoms of the last element in a period is-

(b) 8

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