How can I figured out if molecular polarity is polar or non-polar?

if the arrangement is symmetrical and the are equal length it is non polar

it the arrows are different lengths and if they do not balance each other or if the arrangement is asymmetrical they are polar

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72