How is the nitrogen cycle important to humans? It produces free nitrogen that humans can breathe. It converts nitrogen into a form that humans can obtain by eating other organisms. It produces nitrogen compounds that humans can breathe. It converts nitrogen into a form that humans can obtain by absorbing it through their ski

1 a

2 d

3 a

4 c

explanation:

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