# The magnetic moment due to spin of unpaired electrons is given by

$(a)\;n \sqrt {n(n+1)} \\(b)\;n \sqrt {n(n+2)} \\(c)\; \sqrt {n(n+2)}\\(d)\; \sqrt {n(n+1)}$

Spin-only magnetic moment is related to the number of unpaired electrons by the formula
$\sqrt {n(n+2)}$ is correct.
where n is the number of unpaired electrons.
Hence c is the correct answer.
edited Jan 29