A stock solution of 3.00 M NaCl is available. How many Liters are needed to make 500.0 mL of 2.50 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

girl imma just put my comment here because i need a couple point okurrttt

i think its 5049.

i hope this !