How many grams of sodium chloride are needed to prepare 620.00 mL of 15.0 % sodium chloride solution?

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

the answer is barium and copper bromide

answer carbon and three oxygen atoms;