How many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 76.6 moles of water vapor?

the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.

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

the answer is d.) potassium