(i) How do you calculate the possible valency of an element from the electronic configuration of its atoms?
(ii) Calculate the valency of element X whose atomic number is 9.

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Solution

(i) Number of valence electrons $\leq$ 4; valency = number of valence electrons Number of valence electrons > 4: valency = 8 - number of valence electrons.
(ii)The electronic configuration of element x with atomic number 9 is 2,7.
Its valency = 8-7 = 1 Hence, the valency of element with atomic number 9 is 1.

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(i) How do you calculate the possible valency of an element from the electronic configuration of its atoms? (ii) Calculate the valency of element X whose atomic number is 9.

(i) How do you calculate the possible valency of an element from the electronic configuration of its atoms?
(ii) Calculate the valency of element X whose atomic number is 9.