Dalton's atomic theory

Dalton's atomic theory:

It was proposed by John Dalton 

Here are the main postulates of his theory:

All matter is made of tiny, indivisible particles called atoms. At the time, atoms were still theoretical, but Dalton proposed they were the fundamental building blocks.

Atoms of a specific element are identical in mass, size, and other properties. This meant that all gold atoms, for example, would be exactly alike.

Atoms of different elements differ in size, mass, and other properties. This explained why different elements have different physical and chemical properties.

Atoms can neither be created nor destroyed. This postulate introduced the concept of conservation of mass, meaning the total amount of mass in a closed system remains constant during a chemical reaction.

Atoms of different elements can combine in simple whole-number ratios to form compounds. This explained how elements combine to form new substances with different properties.

Limitations of Dalton's Theory:

We know that atoms are divisible and are made up of even smaller particles like protons, neutrons, and electrons.

Atoms of the same element can have different masses (isotopes) due to varying numbers of neutrons.

It could not explain the combination of atoms with one another.