Question

Which of the following is NOT part of Dalton's Atomic Theory?
A) Each element is composed of tiny indestructible particles called atoms.
B) Atoms combine in simple, whole-number ratios to form compounds.
C) All of the above are part of the atomic theory.
D) All atoms of a given element have the same mass and other properties that distinguish them from the atoms of other elements.
E) Most of the atom's mass and all of its positive charge is contained in a small core called the nucleus.

Answer 1

Answer: Option (E) is the correct answer.

Explanation:

According to Dalton's atomic theory, all matter is composed of atoms which are indestructible in nature and indivisible building blocks.

And, different elements have atoms of different size and mass.

But all the atoms of same element will have same mass and other properties that will distinguish it from atoms of other elements.

On the other hand, Rutherford discovered that most of the atom's mass and all of its positive charge is contained in a small core called the nucleus.

Therefore, we can conclude that the statement most of the atom's mass and all of its positive charge is contained in a small core called the nucleus, is NOT part of Dalton's Atomic Theory.