which noble gas has highest positive electrons gain enthalpy
Answers
"Electron gain enthalpy of an element may be defined as the energy released when a neutral isolated gaseous atom accepts an extra electron to form the gaseous negative Ion i.e. anion.
Noble gases have large positive electron gain enthalpy because the extra electron has to be placed in the next higher principal quantum energy level there by producing highly unstable electronic configuration.
Neon has the highest positive electrons gain enthalpy.
"
Answer: Neon has the highest positive electrons gain enthalpy.
Explanation:
On moving down the group, there is an increase in the size of atoms. As a result, the tendency to accept an additional electron decreases and hence, the electron gain enthalpy decreases from Ne to Rn. However, He has small size and much higher tendency to accept an additional electron. Hence, its electron gain enthalpy is least positive of all the noble gases.
Thus, it is concluded that neon has the highest positive electrons gain enthalpy.