Which subatomic particle is responsible for reactivity of an element? A. electron
B. proton
C. neutron
D. positron

Chemical Reactivity is governed by the electron.

Explanation:

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A. electron

Chemical reactivity is governed by the electron, fundamental particles of negligible mass, and negative charge

Explanation:

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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.

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