Which of the following represents the correct electronic configurations of the element phosphorus?
K=2, L=8, M=5
Phosphorus, with atomic number 15, has the electronic configuration K=2, L=8, M=5, filling shells in order.
The other listed configurations do not correctly distribute 15 electrons across the K, L and M shells according to the standard filling order.
Hence, 'K=2, L=8, M=5' is the correct answer.
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