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

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.

Electron gain enthalpy is one of the important periodic property. Write the oxidation state and covelency of Al in (Al F_6)^3- .

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

Second electron gain enthalpy Is ͟ ͟ ͟͟͟

Atomic size, valency, ionization enthalpy, electron gain enthalpy and electronegativity are the important periodic properties of elements. a) What do you mean by periodicity? b) Periodic properties are directly related to ͟ ͟ ͟͟͟

a) On moving down a group what happens to electron gain enthalpy? b) Why chlorine shows more negative electron gain enthalpy than fluorine?

Assertion: Of all the elements, helium has the highest value of first ionization enthalpy. Reason: Helium has the most positive electron gain enthalpy of all the elements.

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 enthalpy of formation of NaCl(s) is -411.2 kJ mol^(-1). The enthalpy of sublimation of Na(s), its ionization enthalpy in the gaseous state, the bond energy of chlorine, its electron gain enthalpy are 108.4, 495.6, 242 and -348.6 kJ mol^(-1) respectively. The energy required to break one mole of solid sodium chloride into its ions in the gaseous state is (in kJ)

Generally electron gain enthalpy increases along a period and decreases down the group. But electron gain enthalpy of oxygen is -141 kJ//mol while that of sulphur is -200 kJ//mol . Explain.