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CAIE A-Level Chemistry 1.3.3 Order of Sub-Shell Energies

Practise ordering sub-shells by energy and using that order to build ground-state configurations.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • use the increasing-energy sequence 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p
  • distinguish the energy of a sub-shell from its principal-shell number or orbital shape
  • identify the lowest or highest occupied sub-shell from a ground-state configuration

1.3.3—Order of increasing energy of the sub-shells question 1

[Maximum number: 1]

The electronic configuration of a sulfur atom is 1s22s22p63s23p41 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{4}.

Identify which orbital in a sulfur atom has the lowest energy.

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