Oxygen has an atomic number of 8. the n = 1 energy level has two electrons, and the n = 2 energy level has six electrons. oxygen's valence is

Oxygen's valence is 2

Explanation:

Given -

Atomic number of oxygen is 8

The electrons at second energy level must be 8 (8 electron signifies a complete octate/stable state)

It is given that there are 6 electron at second energy level, thus number of electrons required to reach a stable state is equal to

Since, oxygen needs two electron thus it will act as receiver and hence, it valence will be equal to

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it creates acid rain