Rutherford bombarded nitrogen gas with alpha particles, causing some of the nitrogen to change into oxygen by a process of

artificial transmutation

Explanation:

Rutherford is the pioneer of artificial transmutation of elements. He bombarded light elements such as nitrogen with helium atoms. This is resulted in the release of hydrogen atoms. Rutherford concluded that the nitrogen nucleus was fragmented by the energetic alpha particle. Transmutation caused a change in the atomic and mass number of nitrogen thus producing a new element oxygen.

1.43 x 10^-11 j the guy commented the awnser just making sure u see it .