Cambridge AS & A Level Chemistry
1.3Electrons, energy levels and atomic orbitals
Electrons, energy levels and atomic orbitals in Cambridge AS & A Level Chemistry: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic22 practice questions1 lesson
Learning objectives
What the syllabus expects you to be able to do.
- 1.3.1Use the terms shell, sub-shell, orbital, principal quantum number and ground state.
- 1.3.2State the number of orbitals in s, p and d sub-shells and how many electrons each holds.
- 1.3.3Describe the order of increasing energy of the sub-shells in the first three shells and 4s and 4p.
- 1.3.4Describe electron configurations by shell, sub-shell and orbital.
- 1.3.5Explain electron configurations in terms of electron energy and inter-electron repulsion.
- 1.3.6Write full and shorthand electron configurations of atoms and ions (hydrogen to krypton).
- 1.3.7Use electrons-in-boxes notation.
- 1.3.8Describe and sketch the shapes of s and p orbitals.
- 1.3.9Describe a free radical as a species with one or more unpaired electrons.
Lessons
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Shells, sub-shells, orbitals and electron configurations
35 min
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Sample question
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