What requirements must a molecule meet in order to be considered nonpolar?

In order for a molecule to be considered non-polar it must be symmetrical and it must not contain a polar bond. The real difference between a polar and non-polar molecule is that the polar molecule has a positive electrical charge on one side and a negative electrical charge on the other side. The non-polar molecule has no separation of electrical charge as they are evenly distributed across the molecule.

the catch is that the top numbers are atomic masses the bottom numbers are the numbers of protons and electrons in an uncharged atom. they are the number of that atoms as you would find them on the periodic table. further, the numbers on the left are used to determine the missing numbers on the right

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer