A subshell is a division of electron shells separated by electron orbitals. It is characterized by the azimuthal quantum number, also known as the angular momentum quantum number (l).
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Subshells are designated by the letters s, p, d, and f.
The maximum number of electrons in an s subshell is 2, in a p subshell is 6, in a d subshell is 10, and in an f subshell is 14.
The value of the azimuthal quantum number (l) determines the shape of the orbital within a subshell.
Each principal energy level has n types of subshells where n is the principal quantum number.
In multi-electron atoms, energy levels within a shell split into different energies based on their subshells due to electron-electron interactions.