Question

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.​

Answer 1

Answer:

D) both X and Y have 5 valence electrons...

Answer 2

Answer ⤵️

{A} Electronic configuration of X is 2,8,4 while that of Y is 2,8,5