To what final concentration of nh3 must a solution be adjusted to just dissolve 0.060mol of nic2o4 (ksp = 4×10−10) in 1.0 l of solution? (hint: you can neglect the hydrolysis of c2o42− because the solution will be quite basic.)

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