Quantum Numbers for Neon's 2p6 Electrons


Quantum Numbers for Neon's 2p⁶ Electrons

[He]2s22p6 is the electron-configuration diagram for neon. The 2 in the 2p6 in electron-configuration diagram identifies the principal quantum number: n = 2. The p in the electron-configuration diagram identifies the azimuthal quantum number (): =1. The choices are s = 0, p = 1, d = 2 and f = 3. The magnetic quantum numbers (m) for a p orbital are m = -1, 0, +1. Since neon has three 2p⁶ orbitals, the six electrons are in the three orbitals. Each orbital will have two electrons with opposite spin: ms = +½ for an arrow up and ms = -½ for an arrow down. The quantum numbers (n, , m, ms) for the six electrons in the 2p⁶ are: 2, 1,-1, +½;  2, 1, 0, +½;  2, 1, +1, +½; 2, 1, -1, -½;  2, 1, 0, -½; and,  2, 1, +1, -½. See figure 3. 



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