(a) What is the number of valence electrons in the atoms of first elements 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. Helium (He) is the only inert gas having 2 valence electrons.

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(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 ?

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