Name and state the rule that explains the presence of 3 unpaired electrons in phosphorus.
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According to the rule, the pairing of electrons in orbitals of 3p doesnot start in P because out of the 5 valence electrons, 2 electrons go to 3s subshell and 3 are singly occupied in 3 orbitals of 3p sub-shell. Thus, there are 3 unpaired electrons in phosphorus.
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