quantum mechanical model

He discovered the idea about the positively charged particle called “proton”.

The smallest amount of a substance that can take part in any chemical reaction.

What is meant by the Greek word “ATOMOS”?

A Greek philosopher who began to search for a description of matter.

He performed a number of experiments that eventually led to the acceptance of the idea of atoms.

These are formed by the joining of atoms of two or more elements.

He introduced the idea about the negatively charged particle called “electron”.

J.J Thomson compared his work on atomic model on what kind of dessert?

Who reasoned that all atoms that are positively charged particles were contained in the nucleus?

In his experiment on atomic model electrons move in definite orbits around the nucleus, much like planet circles the sun.