From the part of a periodic table, answer the following questions

(a) Atomic number of oxygen is 8. What would be the atomic number of, Fluorine ?
(b) Out of 'X' and 'Q' which element has larger atomic size ? Give reason for your answer.
(c) Out of 'Y' and 'Z' which element has smaller atomic size ? Give reason for your answer.

Explanation

(a) Atomic number of Fluorine is (8 + 1) = 9.
(b) Since the atomic size of the elements decreases along a period the element 'X' has a smaller size than element 'Q'.
(c) Since the atomic size of the elements increases down the group, element 'Y' has a smaller size than element 'Z'.