Through the work of scientists such as Copernicus and Galileo, the current accepted theory is that Earth rotates on its axis and revolves around the sun. What evidence did you see in the motions of the sun and stars to support the theory that Earth rotates and revolves? Will give

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

answersilicon (si); oxygen (o);