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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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(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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(a) 1

(b) 8

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