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(a) You are given an elemetn ""_(7)^(14)X.Find out (i) number of protons, elecirons andneutrons in X. (ii) valency of X (iii) electronic configuration of X. (b)If bromine atom in the form of, say two isotopes " "_(35)^(79) Br (49.7%) and " "_(35)^(81)Br (50.3%). Calculate the average atomic mass of bromine atom.

Answer»

Solution :(a) The atomic number of X : 7
(1) Number of protons : 7
Number of neutrons : 7
(ii) VALENCY of X : 3
(III) Electronic configuration : 2, 5


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