A statement which is not a part of Dalton's atomic theory is:

Matter is made of atoms.

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All atoms of a given element are identical

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Atoms are composed of sub-atomic particles called electron, proton and neutron

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Atoms of different elements have different mass and different properties

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Solution

The correct option is C
Atoms are composed of sub-atomic particles called electron, proton and neutron

According to the Dalton's atomic theory, atoms are indivisible i.e. they are not composed of any sub-atomic particles

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Similar questions

Assertion : A future discovery of sub atomic particles led to the failure of Dalton’s atomic theory.

Reason : An atom is made up of protons, neutrons and electrons.

Which of the following are true according to Dalton’s Atomic Theory?

(i) Atoms can neither be created nor destroyed in a chemical reaction.

(ii) Atoms of different elements have different masses and chemical properties.

(iii) Atoms can be broken down into smaller parts like Protons,Electons And Neutons .

(iv) Atoms of an element have variable chemical properties depending on the Chemical reactions

(v) The relative number and kinds of atoms vary in a given compound.

(vi) Atoms combine in the ratio of small whole numbers to form Compounds.

Consider the following statements:

1. The number of protons in the nucleus of an atom of a given element is called the atomic number of that element.

2. Mass number of an atom is defined as the sum of number of protons and neutrons present in the nucleus of an atom.

3. Atoms of an element that have the same atomic number (Z) but different mass number (A) are called isotopes.

Which of the above statements is incorrectly stated?

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