What is atomic theory in chemistry?

What is atomic theory in chemistry?

Atomic theory is a scientific theory that explains the nature of matter, stating that all matter is composed of atoms.

Who proposed the first atomic theory?

The first atomic theory was proposed by John Dalton in the early 19th century.

What are the main postulates of Dalton's atomic theory?

Dalton's atomic theory includes the following postulates: 1) All matter is made of atoms, 2) Atoms are indivisible, 3) Atoms of the same element are identical, and 4) Atoms combine in simple whole-number ratios to form compounds.

How has atomic theory evolved over time?

Atomic theory has evolved significantly, with contributions from scientists like J.J. Thomson, Ernest Rutherford, and Niels Bohr, leading to the modern quantum mechanical model of the atom.