Question

‘Electrons revolve around the nucleus in fixed orbits or shells called energy levels’. State how these energy levels are represented.

Answer 1

1. Electrons revolve around the nucleus in – fixed ‘orbits’ called energy levels
2. The energy levels 1, 2, 3… are represented by – integer ‘n’ or as K, L, M, N…
3. Electrons rotate around the nucleus, in one or more of the energy levels.