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Groups and Periods (Mendeleev's)

You are given...

Question

You are given an element ₇X¹⁴.Find out.
a.1.number of protons,electronsneutrons in X
a.2.valency of X
a.3.electronic configuration of X.
b.If Bromine atom is available in the form of, say two isotopes
₃₅BR⁷⁹(49.7%) ₃₅BR⁸²(50.3%).

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Solution

Given: ₇X¹⁴
i.e atomic no. = 7 and mass no. = 14.
Mass no. = no. of protons + neutrons
Atomic no. = no.of protons/electrons.
Thus no. of protons = electrons = 7
No. of neutrons = 14 -7 = 7
Valency = 3
electronic config = 2,5

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