Principal quantum shell (n = 1), Contains only one subshell (s), Principal quantum shell (n = 2), Contains two subshells (s and p), Principal quantum shell (n = 3), Contains three subshells (s, p and d), Principal quantum shell (n = 4), Contains four subshells (s, p, d and f), s subshell, Maximum of 2 electrons, p subshell, Maximum of 6 electrons, d subshell, Maximum of 10 electrons, f subshell, Maximum of 14 electrons, First principal quantum shell, Has one subshell, Second principal quantum shell, Has two subshells, Third principal quantum shell, Has three subshells, Fourth principal quantum shell, Has four subshells, Number of subshells, Equal to the principal quantum number (n), Quantum subshell, A subdivision of a principal quantum shell, Principal quantum shell, The main energy level occupied by electrons, 1s, The lowest-energy subshell, 2p, First p subshell to appear, 3d, First d subshell to appear, 4f, First f subshell to appear, Relative energy of subshells, Increases from 1s to higher-energy subshells

Quantum shells and subshells

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