(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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Solution

(a) The number of valence electrons in the atoms of first elements in a period is 1.

(b) The usual number of valence electrons in the atoms of the last element (inert gas) in a period is 8.

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Similar questions

(a) What are valence electrons? Where are valence electrons situated in an atom ?

(b) What is the number of valence electrons in the atoms of an element having atomic number 13 ? Name the valence shell of this atom.

(a) Define valency of an element. What valency will be shown by an element having atomic number 14 ?

(b) What is the relation between the valency of an element and the number of valence electrons in its atoms ? Explain with examples.

What happens to number of valence electrons in atoms of elements as we go down a group of the periodic table ?

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