Q. 215.0( 5 Votes )

Four elements A,B

Answer :

(a) Electronic configuration of element D is


D15 = 2, 8, 5


Element D has 5 valence electrons and its valency is 3 because it requires 3 electrons to acquire inert gas configuration.


(b) A12 = 2, 8, 2


B13 = 2, 8, 3


C14 = 2, 8, 4


D15 = 2, 8, 5


Since these elements are belong to same period because all elements have same shells and we know that radius of elements decreases from left to right in a period so element A will have largest radius.


(c) We know that metallic oxides are basic in nature and metallic nature decreases from left to right in a period so element A will form the most basic oxide.

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