The magnetic moment of `Mg-"atom"` is more than `K-"atom"` as the former has two electrons in outermost shell.
The magnetic moment `N-"atom"` is more than magnetic moment `O-"atom"` and former has more number of unpaired electrons.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false
D. If assertion is false but reason is true.

Answer

D

Explanation

(d) Magnetic moment depends upon number of unpaired electrons and given by `= sqrt(n(n + 2))`, where `n` is no. of unpaired electrons.
`{:(,,"Val ence el ectron","Unpaired el ectron",),(K,,1,,1),(Mg,,2,,0),(N,,3,,3),(O,,4,,2):}`.