a) The electron gain enthalpies of Be and Mg are positiVe. What is your opinion? Justify.
b) Electron gain enthalpies of nobles gases have large positive values. Why?

Second electron gain enthalpy Is ͟ ͟ ͟͟͟

Give reason for the following: Electron gain enthalpy of noble gas is almost zero.

Account for the following: Noble gases have large positive electron gain enthalpies.

Electron gain enthalpy is one of the important periodic property. Define electron gain enthalpy.

Electron gain enthalpy is one of the important periodic property. Explain any two factors affecting electron gain enthalpy.

Choose the incorrect statement. : Chemical reactivity tends to be high in group 1 metals, lower in elements in middle and increases to maximum in the group 17., Halogens have very high negative electron gain enthalpy., Noble gases have large positive electron gain enthalpy., Decrease in electronegativities across a period is accompanied by an increase in non-metallic properties.

The variation in electron gain enthalpies of elements is less systematic than for ionization enthalpies. Out of oxygen and sulphurwhich has greater negative value for electron gain enthalpy? Justify.

Justify the following: The electron gain enthalpy of 'F' is lower than that of 'Cl .

Electron gain enthalpy is an important periodic property. a) What is meant by electron gain enthalpy? b) What are the factors affecting electron gain enthalpy? c) How electron gain enthalpy varies on moving across a period? Justify.