Models of the Atom Flashcards

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What did John Dalton think atoms were like in his model?

He thought atoms were tiny, solid spheres that could not be split or changed.

Electrons were spread through a ball of positive charge, like fruit in a pudding.

The gold foil, or alpha particle scattering, experiment.

Atoms are mostly empty space with a tiny, dense, positively charged nucleus in the centre.

In the nuclear model, positive charge and most mass are in a small central nucleus, not spread out.

He said electrons move in fixed orbits, or energy levels, around the nucleus.

It explained why electrons stay in fixed orbits and why atoms give only certain colours of light.

A tiny nucleus made of protons and neutrons is at the centre of the atom.

Electrons are in shells, or energy levels, around the nucleus.

The nucleus is about 100,000 times smaller than the whole atom.