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13 questions from this quiz
Protons and neutrons
0 (or 0.0005)
0
1×10−101 × 10^{-10}1×10−10 metres
10,000 times smaller
In the nucleus
A ball of positive charge with negative electrons embedded in it
Alpha particles
The atom is mostly empty space
Mass is concentrated in the centre
Energy levels or shells
James Chadwick
Electron moves to a higher energy level
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