Electronic configuration of elements P, Q, R and S are given below:
P – (2, 2)
Q – (2, 8, 2)
R – (2, 8, 1)
S – (2,1)
Which of the following options is correct?

Q. The pair of elements which would combine to form a compound is ______

Q. The electronic configuration of two elements $X$ and $Y$ are given below:
$X=2,8,2$
$Y=2,8,7$
The formula of a compound that can be formed between these two elements is:

Q. The electronic configurations of three elements X, Y and Z are given below. Which of the following is correct?

Q.

The electronic configurations of atoms of three elements A. B and C are (2, 8, 1), (2, 8, 6) and (2, 8, 18, 7) respectively.
Which option classifies the elements A. B and C as metals and non-metals correctly?