Short Answer Type(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) The valency of an element is determined by the number of electrons present in the last shell.
If a number of valence electrons are less than or equal to 4 then, valency = a number of valence electrons.
If, the number of valence electrons greater than 4 then, valency = 8 – number of valence electrons.
(ii) The electronic configuration of element X with atomic number 9 is 2,7
Valency of X = 8−7 =1
Hence, the valency of the element with atomic number 9 is 1.
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