Which of the following parts (postulates) of dalton's atomic theory has been modified in light of later discoveries?
1. atoms are indivisible.
2. chemical reactions involve rearrangement of atoms.
3. all matter is made up of very small particles called atoms.
4. compounds are formed from atoms

The following postulate of Dalton's atomic theory which has been modified

in light of later discoveries is that Atoms are indivisible.

Atoms have been found to be divisible into parts known as the nucleus and

electron cloud. The nucleus is further sub-divided into 2 main parts called the proton and neutron.

The proton is positively charged, the electron is negatively charged while the neutron has a neutral charge and they help in maintaining stability of atoms.

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1 False. Atoms can be divided, see case of radioactive materials

Explanation:

Dalton's theory says that matter is made up of very small particles called atoms that are indivisible and cannot be destroyed, chemical compounds are made up of atoms.

With this statement, we can review the proposals,

1 False. Atoms can be divided, see case of radioactive materials

2 True. Chemical reactions are performed by atoms.

3 True. This statement remains unchanged.

4 True. The compound or molecules are formed by atoms