Here, series producer Paul Sen explains why the realisation that everything we see in the Universe is made of atoms could be the most important discovery ever. No-one ever expected the atom to be as ...

Niels Bohr adapted Ernest Rutherford's nuclear model. Bohr did calculations that led him to suggest that electrons orbit the nucleus in shells. The shells are at certain distances from the nucleus.

Watch this video to understand the development of the atomic model and the discoveries made by experts. The scientist John Dalton carried out a series of experiments. He concluded that all matter was ...