Question

Describe the main points of Dalton’s atomic theory and then explain what points of the theory are still accepted in modern atomic theory and what points have been changed as the result of later experiments and discoveries.
These are the points I know... and thats about as much as I know HELP

1) All matter is made of atoms.
2) Atoms of a given element are identical in size, mass and chemical properties.
3) Atoms of different elements have different masses and properties.
4) Compounds are formed by a combination of two or more different kinds of atoms. The elements combine in simple, whole-number ratios.
5) Atoms cannot be subdivided, created, or destroyed, but merely rearranged in their compounds with other elements. They can be combined, separated, or changed in the way in which

Answer 1

@Preetha @tinybookworm

Answer 2

1) Scientists accept this.

2) Now we know that not all the atoms of a element are the same. For example: we got isotopes, which has the same number of protons but different number of neutrons.

3) This is true, but sometimes the mass of a radioactive isotope can be equal to the mass to other element. For example, C14(radioactive)=N14

4) This is correct. Compound must be formed from at least two elements. And the elements combine in simple, whole-number ratios.

5) As we know, atoms are formed from protons, neutrons and electrons. Nowadays, scientists can easily create or destroy those. In nuclear physics, we know that there are smaller particles than proton or neutron, e.g. lepton, positron

Answer 3

Okay so those were the changes made ?