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.

A brief information about two atoms X and Y is given: X: Atomic number

1.	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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