Question

who discovered that the nucleus exists in the center of the atom?
chadwick
dalton
bohr
rutherford

Explanation:

Ernest Rutherford's gold - foil experiment led to the discovery that the nucleus exists in the center of the atom. Chadwick discovered the neutron, Dalton proposed the atomic theory, and Bohr proposed a model of the atom with quantized energy levels.

Answer:

D. Rutherford