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CAIE A-Level Chemistry 1.3.4 Electronic Configurations

Practise representing electron numbers at shell, sub-shell and individual-orbital level without mixing the notation.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • show total electrons in each shell while keeping shell number distinct from electron count
  • write sub-shell notation with coefficients and superscripts whose electron totals equal the species charge
  • use orbital boxes to show separate orbitals, electron pairing and unpaired electrons

1.3.4—Electronic configurations to include question 1

[Maximum number: 1]

The electronic configuration of an atom of sulfur is 1s22s22p63s23p41 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{4}.
How many valence shell and unpaired electrons are present in one sulfur atom?

valence shell

electrons

unpaired

electrons

2

1

4

2

6

0

6

2

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