Question

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Compare Dalton's atomic Theory with Modern atomic Theory.

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Answer 1

The latest research on the atom has proved that most of the postulates of Dalton's atomic theory contradict. However, Dalton was the right atoms to take part in chemical reactions.

Comparisons of Dalton's atomic theory with the modern atomic theory.

Dalton’s atomic theory:

∙ Atoms are invisible.

∙ Atomic of the same element are similar in every respect.

∙ Atoms combine in a simple whole-number ratio to form molecules.

∙ Atoms of different elements are different.

∙ Atomic can neither be created nor be destroyed.

Modern atomic theory:

∙ Atoms are divisible and consist of electrons. protons neutrons and even more sub-particle.

∙ Atoms of the same element may differ from one another.

∙ Atoms of different elements may be similar called isobars.

∙ Atoms combine in a ratio which is not a simple whole number ration; e.g. in sugar, the C

12

H

22

O

11

ratio is not a whole number ratio.

Answer 2

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Dalton's atomic theory :

1. Atoms are indivisible particles .
2. Atoms can neither be created nor destroyed .
3. The atoms of an element are alike in all respects but they differ from the atoms of other elements
4. Atoms of elements combine in small whole numbers to form molecules .

Modern atomic theory :

1. Atoms are divisible into sub atomic particles like protons electrons and neutrons .
2. Atoms can be created and destroyed by nuclear fusion and fission .
3. The atoms of an element may not be alike in all respects as is seen in the case of isotopes .
4. In the formation of organic compounds the numbers can be very big such as thousands .

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