The presence of protons and neutrons at the center of the atom was suggested by:
- AProtons by $J. Chadwick$ and neutrons by $E. Goldstein$
- BProtons by $E. Goldstein$ and neutrons by $J. Chadwick$
- CProtons by $E. Goldstein$ and neutrons by $J.J. Thomson$
- DProtons by $J. Chadwick$ and neutrons by $J.J. Thomson$
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