Theories of the atom (from the earliest model of the atom to the most recent one):
1. Dalton's model of the atom - Solid sphere atom
Dalton proposed that matter is composed of small, indivisible objects called atoms.
2. Thompson’s model of atom - Plum pudding model
He discovered electrons. In this model, the atom is made up of electrons that float in a “cloud” of positive charge.
3. Rutherford's model of the atom - Nuclear model
In this model, atom is a tiny, dense, positively charged core - nucleus surrounded by lighter, negatively charged electrons.
4. Bohr's model of the atom – Planetary model
Bohr explained that the electrons are around the nucleus in certain special orbits at different energy levels.
5. Schrodinger model of atom - Quantum model
This theory proposes that electrons move in waves and its location is unknown (there are only “clouds of probability”).