20,340
edits
Changes
no edit summary
:[https://www.amazon.co.uk/gp/product/1782948163/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948163&linkCode=as2&tag=nrjc-21&linkId=0fdbfd5dd397d6e24a9dfb250f08587f ''Energy levels in atoms, pages 128, 151, 153, 154, GCSE Physics, CGP, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1782945733/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945733&linkCode=as2&tag=nrjc-21&linkId=2a2dbec9db6bf5766c0458d908fa0a52 ''Energy levels, pages 49, 50, GCSE Physics; The Revision Guide, CGP, Edexcel '']
==Key Stage 5==
===Meaning===
'''Energy levels''' are the discrete amounts of [[energy]] that [[electron]]s in an [[atom]] can have.
===About Energy Levels===
*[[Electron]]s occupy specific [[Energy Level|energy levels]] or [[Electron Shell|shells]] around the [[Atomic Nucleus|nucleus]].
*When an [[electron]] absorbs [[energy]], it can move to a higher '''energy level''' ([[Excited|excitation]] in which the [[atom]] is said to be [[excited]]. NB: not the [[electron]] itself).
*When an [[electron]] falls to a lower '''energy level''', it [[emit]]s [[energy]] in the form of a [[photon]].
*The [[energy]] difference between '''levels''' determines the [[frequency]] of the [[emit]]ted or absorbed [[photon]].
*'''Energy levels''' are quantized, meaning [[electron]]s can only exist in these specific levels and not in between.