Question

A brief information about two atoms P and Q is given
below.
P: Atomic number = 8, Mass number = 16
Q : Atomic number = 8, Mass number = 18
Which of the following is correct about these two atoms?
A. Electronic configuration of P is 2, 4, 2 while
that of Q is 2, 6.
B. Both P and Q contain same number of neutrons.
C. P and Q both have 2 electron shells.
D. Both P and Q have 4 valence electrons.​

Answer 1

Answer:

D. Both P and Q have 4 valence electrons.