Question

which of these is not a contribution made by Thomson?
a) discovery of electron
b) discovery of atomic nucleus
c) atom is electrically neutral
d) plum pudding model​

Answer 1

Explanation:

discovery of electron is the right answer

Answer 2

Concept Introduction:-

A cathode-ray tube's (CRT) electron beam is bent by applied electric or magnetic forces, creating a trail on a fluorescent screen.

Explanation:-

We have been provided a question

We need to choose from the given alternatives the correct option

The correct option is $a)$ discovery of electron

It is because J.J Thomson discovered electrons by conducting cathode ray experiment. J.J. Thomson invented the electron by playing with a tube that was Crookes, or cathode ray. He had shown that the cathode rays were charged negatively. Thomson realized that the accepted model of an atom did not account for the particles charged negatively or positively.

Final Answer:-

The correct answer is option  $a)$ discovery of electron.

#SPJ3