Year 12 Chemistry
Atomic structure and isotopes
Protons, neutrons and electrons, isotopes and relative atomic mass, mass spectrometry, electron shells, sub-shells and orbitals, electron configuration and ionisation energies.
Atomic structure and isotopes free practice
No timer and no account needed. Check each answer as you go, then read the explanation.
1. What is the maximum number of electrons that the fourth shell (n = 4) can hold?
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