SSC MTS EXAM

Detailed explanation-1: -Dalton based his theory on the law of conservation of mass and the law of constant composition. The first part of his theory states that all matter is made of atoms, which are indivisible. The second part of the theory says all atoms of a given element are identical in mass and properties.

Detailed explanation-2: -According to Dalton’s atomic theory, atoms of the same element are identical in all respects.

Detailed explanation-3: -Dalton’s assumption that all atoms of the same element are equal in their properties is not valid. The reason for the inaccuracy of this assumption is the existence of isotopes. Namely, isotopes are atoms of the same chemical element that differ in the number of neutrons in the nucleus.