Question

who was the scientist who proposed that the atom is a solid sphere of matter?
dalton
schrödinger
bohr
rutherford

Explanation:

John Dalton proposed the solid - sphere model of the atom, considering atoms as indivisible solid spheres. Schrödinger developed wave - mechanical model, Bohr proposed the planetary model of the atom, and Rutherford proposed the nuclear model of the atom.

Answer:

A. Dalton