Question

Who first split the atom by 4 changing nutri nitrogen atoms into oxygen atoms

Answer 1

No - there is only 1 proton in a hydrogen atom and so it can't be split.

When we think of splitting an atom, we are talking about a nuclear fission reaction - one that involves taking an atom of some element (Uranium is a good example) and cleaving it in two, to capture the energy released from the weak nuclear force (which is what happens in a nuclear reactor):

Answer 2

Heyaa☺

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Ernest Rutherford has split theatom by 4 chaning nutri nitrogen atoms into oxygen atoms.

Answer-Ernest Rutherford.

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Hope you understand..✌