In Bohr’s atomic model, what was the key new concept introduced, beyond Rutherfo

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1. In Bohr’s atomic model, what was the key new concept introduced, beyond Rutherford’s nuclear theory?

The plum pudding structure

The dual, wave-particle nature of the electron

The quantisation of an electron’s energy into fixed, discrete levels

The uncertainty principle

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Bohr proposed that electrons could only occupy specific, quantised energy levels around the nucleus, rather than any arbitrary orbit — a radical departure from classical physics.