Write the complete chemical symbol for the neutral element that contains 7 electrons, and 9 neutrons.

7/16 N

Explanation:

Since it is neutral we know that it also contains 7 protons, which is shown by the atomic number. 7 matches with nitrogen.

There are 9 neutrons so add 9+7=16

7/16 N (not sure how to show it on but it would look something like this)

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