History of the Atom Flashcards

All 6 cards in this deck

What is the plum pudding model of the atom?

A ball of positive charge with negative electrons embedded in it.

What conclusions came from the alpha particle scattering experiment?

The mass of an atom is concentrated at the centre (the nucleus) and the nucleus is charged.

What change did Niels Bohr make to the nuclear model?

He suggested electrons orbit the nucleus at specific distances (in energy levels/shells).

What did the experimental work of James Chadwick show?

Evidence for the existence of neutrons within the nucleus.

Put the electron, proton and neutron in the order they were discovered, earliest first.

Electron, proton, neutron.

True or false? In the plum pudding model most of the atom is empty space.

False. The plum pudding atom is solid positive charge throughout; it is the nuclear model that is mostly empty space.