Atomic theory as it is known today is the result of the contributions of many scientists who did the research, disproved old models, suggested new models, and added to the atomic theory. The listed contributions are some of the concepts that were developed in the history of the atomic theory. Arrange them in order from oldest to most recent.

The contributions are not listed in the question. I guess the following are the options you are talking about.

Same elements have same properties:

In 1803 Dalton gave the atomic theory that the properties of the atoms of the same element are same.

Electrons in Orbits:

Electrons were discovered in 1897 by J J. Thompson but the hypothesis of electrons in the orbits were given by Hantaro Nagaoka in 1904.

Plum pudding model:

Plum pudding model was given by J. J. Thompson in 1904 with the concept of positively charged medium containing the negatively charged electrons in it.

Positively Charged Atomic Nucleus:

Earnest Rutherford in 1911 discovered the positively charged atomic nucleus.

the answer is a and have a great day

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