...that electrons orbit the nucleus in circular orbits.
That was the earliest version of atomic theory, proposed by the Greek philosopher Democritus.Democritus
He proposed anti-particles in atoms.
John Dalton. He put forward the atomic theory in 1808.
The schoolmaster who studied chemistry and proposed the atomic theory was John Dalton. Dalton's atomic theory, published in the early 19th century, stated that all matter is composed of tiny, indivisible particles called atoms. His work laid the foundation for modern atomic theory.
Albert Einstein was the person who propesed the atomic theory and the study of atoms.
The atomic theory was first proposed in the 5th century BC by the Greek philosopher Leucippus and his student Democritus. The theory of relativity was first proposed by Albert Einstein in 1905 with his special theory of relativity, followed by his general theory of relativity in 1915.
The ancient Greeks did not perform any experiments to test the atomic theory proposed by Democritus. To the ancient Greeks the atomic theory was a part of philosophy, not science.
john Dalton
The schoolteacher who studied atoms and proposed an atomic theory was John Dalton, known for his development of modern atomic theory in the early 19th century. Dalton's theory proposed that all matter is composed of small, indivisible particles called atoms that are unique to each element and are rearranged in chemical reactions. His work formed the foundation for modern chemistry.
the Greek Philosophers did not test their theory.
Benjamin Franklin's contribution to the atomic theory was his proposal that electricity was a fundamental force that could be understood through atomic models. He conducted experiments with electricity and proposed the idea of positive and negative charges, which later contributed to the development of the atomic theory.
The first modern atomic theory was proposed by John Dalton in the early 19th century. Dalton's theory stated that all matter is made up of tiny, indivisible particles called atoms, and that atoms of different elements have different masses and properties.