Simple Description

An old model of atomic structure that stated that atoms were balls of positive charge with negative electrons dotted around inside them, like raisins in a plum pudding.

Further Detail

Also called the "christmas pudding model". Rutherford proved the plum pudding model wrong by firing alpha particles straight at gold nucleii and showing that the alpha particles were deflected by varying angles. The Plum Pudding model couldn't explain this observation as it predicted all the alpha particles would travel straight through.

Related Words:

• Alpha scattering experiment
• Rutherford scattering experiment
• Atom

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