The 15^th group elements have low electron enthalpy values. The element with positive electron gain enthalpy is

Melting point…As>Sb>Bi>P>N ;

Boiling point….N<P<As<Bi<Sb ;

Density……….N<P<As<Sb<Bi ;

Electronegativity……N>P>As>Sb=Bi

Due to stable ns²np³ configuration 15^th group elements have low electron gain enthalpy values.

Electron gain enthalpy of Nitrogen is positive

Ionization enthalpy…N>P>As>Sb>Bi

IP₁ of N>O…P>S and As>Se but Sb<Te and Bi<Po;