Question

which model of the atom first introduced the idea of a nucleus?
daltons model
thomsons model
rutherfords model
bohrs model

Explanation:

• Dalton's model viewed atoms as indivisible spheres, no nucleus concept.
• Thomson's model (plum - pudding) had electrons in a positive "soup", no nucleus.
• Rutherford's gold - foil experiment led to his model, where he proposed a small, dense, positively - charged nucleus at the center of the atom, with electrons orbiting around it.
• Bohr's model built on Rutherford's, focusing on electron energy levels, but the nucleus idea was already introduced by Rutherford.

Answer:

C. Rutherford's model