Question

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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

(A) Electronic configuration is based on atomic number and not atomic mass.

So, electronic configuration of

X is 2,5 and Y is also 2,5.

(B) X contains 7 neutrons and Y contains 8 neutrons.

(C) Both X and Y have 2 shells as they have the same electronic configuration.

(D) We wrote the electronic configuration in option A, clearly both have valence electron 5.

So,Option D is True

Answer 2

Answer:

(D) Both X and Y have 5 valence

electrons.