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It is the rule for filling of electrons in orbitals. It states that,

When orbitals of equal energy (such as px, py, pz) are available electrons, they fill orbitals singly to keep the spin parallel.

For example,

N(Z=7)= 1s2, 2s2, 2px2, 2py1 (wrong)

N(Z=7)= 1s2, 2s2, 2px1, 2py1, 2pz1 (correct)

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12y ago

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