Unit 7: Modern Physics

J.J. Thomson's model where the atom is a blob of positive charge with tiny negative electrons ______ throughout.

Proposed a tiny, dense, positively charged ______ with electrons orbiting around it.

Electrons can only exist in specific, discrete ______ levels or 'shells' around the nucleus.

Energy levels that come in fixed, ______ amounts, like steps on a staircase.

The phenomenon where electrons are ______ off a metal surface when light shines on it.