Question

Among the following the odd pair is

Options

• \[\ce{^18_8{O}}\], \[\ce{^19_9{F}}\]

• \[\ce{^40_18{Ar}}\], \[\ce{^14_7{N}}\]

• \[\ce{^30_14{Si}}\], \[\ce{^31_15{P}}\]

• \[\ce{^40_20{Cr}}\], \[\ce{^39_19{K}}\]

Answer 1

\[\ce{^40_18{Ar}}\], \[\ce{^14_7{N}}\]