Question

Out of `B, O, N,` and `F`, which element is the largest?

Answer 1

Atomic boron is the largest!

Explanation:

Atomic size decreases across a Period, and increases down a Group. We have four 2nd row elements, whose size directly relates to their position on the Periodic Table.

As a chemist, as a physical scientist, you should actually look up a text to give quantitative values to your answer.