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10. Why do we no longer accept Dalton’s statement that all atoms of an element       ...

10. Why do we no longer accept Dalton’s statement that all atoms of an element

       must be exactly alike?

Science   Chemistry   
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Answer #1

he indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons

However an atom is the smallest particle that takes part in chemical reactions.

According to Dalton, the atoms of same element are similar in all respects. However, atoms of some elements vary in their masses and densities. These atoms of different masses are called isotopes. For example, chlorine has two isotopes with mass numbers 35 and 37.

Dalton also claimed that atoms of different elements are different in all respects. This has been proven wrong in certain cases: argon and calcium atoms each have an atomic mass of 40 amu. These atoms are known as isobars.

with this reasons this theory no longer exist

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