Can anyone plz help me

Remember zero pairs. Zero pairs are when two numbers are of equal numbers but have opposite signs.

For example: 10 and -10 is a zero pair because they will equal 0.

So doing the same thing for this, the answer is Fluorine.

-3 + 3 = 0 or 3 - 3 = 0.

Simple! Hope it helped

I have no clue man maybe ask the teacher