Which material is the BEST conductor of heat at room temperature? O A. water
O
B. copper
O
C. sulfur
O D. air

it's filtration, but this is an assumption so my apologies if i got this

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