An element X belongs to group 2 and another element Y belongs to group 15 of the periodic table :
An element X belongs to group 2 and another element Y belongs to group 15 of the periodic table :
(a) What is the number of valence electrons in X ? (b) What is the valency of X ?
(c) What is the number of valence electrons in Y ? (d) What is the valency of Y ? Explain how you have arrived at your answers.
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(a) 2.
For groups 1 and 2, the number of valence electrons is equal to the group number.
(b) 2 .
Valency is determined by the number of valence electrons present in the atom of the element.
(c) 5 .
For groups 13 to 18, the number of valence electrons is equal to (group no. – 10).
(d) 3 .
The number of electrons lost or gained by one atom of an element to achieve the nearest inert gas configuration, gives us the valency.
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