What mass of sodium sulfate is needed to make 2.5 L of 2.0 M solution?
A 120 g
B 150 g
C 180 g
D 710 9
E 750 g

increased stability in the completion of fluorine's outer shell.

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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