Question

An ion M^+3 contains 10 electrons and 14 neutrons. Element M has valency ewual to the valency of an other element X which has five electrons less than Air in its outermost shell. Identify the elements M and X

Answer 1

Friend, X is boron, as 10 - 5 = 5 and the no. of electrons is 5 and we know that no. of electrons = no. of protons

M is aluminum

When we add 3 electrons, the no. of electrons becomes 13

again, no. of electrons = no. of protons

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