A brief information about two atoms X and Y is given:
X: Atomic number = 7, Mass number = 14
Y: Atomic number = 7, Mass number = 15
Which of the following is correct about
these two atoms?
(A) Electronic configuration of X is 2, 8,4
while that of Y is 2, 8, 5.
(B) Both X and Y contain 7 neutrons.
(C) X has 2 electron shells while Y has
3 electron shells.
(D) Both X and Y have 5 valence electrons.
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