Question

Who was the first scientist to propose that all matter was made of small spheres called atoms?

• A. John Dalton (early 1800's)
• B. Ernest Rutherford (1911)
• C. Niel's Bohr (1913)
• D. Joseph John Thomson (1897)

Answer 1

The correct option is A John Dalton (early 1800's)

John Dalton was the first scientist to propose that all matter was made of small spheres called atoms. The main points of Dalton's Atomic theory given by John Dalton are:-

(a) Elements are extremely small particles called atoms.

(b) Atoms of a given element are identical in size, mass, and other properties,

(c) Atoms cannot be sublimed, created, or destroyed.

(d) Atoms of different elements combine in simple whole-number ratios to form chemical compounds.

(e) In chemical reactions, atoms are combined, separated, or rearranged.

Option $A$ is correct.