Tính lực ion của các dung dịch hỗn hợp sau: a) KCl 10-3 M + MgSO4 10-3 M
b) AlCl3 3.10-3 M + HCl 2.10-2 M
c) NaNO3 0,01 M + NaOH 0,02 M + HClO4 0,01 M

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!

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~ trueboss72