What is the difference of John Dalton's atomic theory to today's atomic theory?

Answer 1

Although Dalton's theory remains valid in modern atomic theory, there are some differences. Dalton's theory stated that atoms were indivisible and indestructible, but discoveries in modern atomic theory showed that there are subatomic particles that are smaller than the atom. Similarly, through nuclear reactions, an element's atoms can be transformed into atoms of another. Modern atomic theory includes isotopes while Dalton's theory does not have this phenomenon.

Answer 2

Dalton's Atomic Theory is as follows:

1) All matter is made of atoms. Atoms are indivisible and indestructible.

2) All atoms of a given element are identical in mass and properties.

3) Compounds are formed by a combination of two or more different kinds of atoms.

4) A chemical reaction is a rearrangement of atoms.

Dalton's atomic theory is correct in essence with a few exceptions to his rules:

1) Atoms are the smallest unit of mater that retain the physical and chemical properties of an element, however, they are divisible by non-chemical means.

2) All atoms of a single element contain the identical number of protons and electrons, however, their masses may vary with the number of neutrons in different isotopes (some of which are unstable and decay).

For very basic purposes, Dalton's theory holds true.

Answer 3

Today we know that atoms are divisible and that elements have different isotopes that differ by mass number due to differing numbers of neutrons.

Answer 4

John Dalton could not provide the discovery of isotopes.

Answer 5

modern is better

Answer 6

The quantic theory.