Constance helped Ms. Mora move the box of materials down the hall to the science lab. Constance pushed
with a force of 3N right and Ms. Mora pushed with a
force of 7N right. What was the net force on the box?

law of conservation of matter

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