Question

if an atom of Oxygen loses a proton, is it still Oxygen?​

Answer 1

The answer is No

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Answer 2

No.

The number of protons in the nucleus of an atom is the thing that uniquely determines what element the atom belongs to.

If the atom has 8 protons in its nucleus, then it's an atom of Oxygen.

If the atom has 7 protons in its nucleus, then it's an atom of Nitrogen.