Amain goal of most environmental scientists is to achieve?
a- biodiversity
b- cost-benefit balance
c- sustainability
d- supply and demand

A main goal of most environmental scientists is to achieve biodiversity.

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

it is stable as it is in group 0 which have full outer shells of electrons