How is an atomic emission spectrum produced? A
Energy is absorbed as electrons move from a higher to a lower energy level.

B
Energy is absorbed as electrons move from a lower to a higher energy level.

C
Energy is released as electrons move from a higher to a lower energy level.

D
Energy is released as electrons move from a lower to a higher energy level.

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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!

if you need further assistance, let me know: )

~ trueboss72

b) nuclear ive learned that in a pedtrodic table