Question

What is the electron gain enthalpy of halogens?

Answer 1

Electron gain enthalpy is the amount of the energy released while converting a neutral isolated gaseous atom into negatively charged ion.

In Halogens Group, Chlorine is having largest Electron gain Enthalpy, then Flourine, then Bromine and then Iodine.

Electron gain enthalpy is the negative of the electron affinity.

Electron gain enthalpy depends upon the Nuclear charge. It is directly proportional to it. If the Nuclear charge increases, then the Electron gain enthalpy also increases.

Now, Halogens are those non-metals which are present in the corner of the periodic table just before the Noble gases. In Period, they are having second last position.

When we move across the period, nuclear charge increases due to which electron gain enthalpy also increases.

Hence, the Electron gain enthalpy of the Halogens are high.

Although, Noble gases which lie at the corner just after the halogens have positive electron affinity, means they don't lose the energy when electron is added to them, but they require some energy because they are having full filled orbitals, and hence, new electron coming will be filled in upper orbitals which will create the unstability.

Hope it helps.

Answer 2

Electron gain enthalpy of an element is the energy released when a neutral isolated gaseous atom accepts an extra electron to form the gaseous negative Ion i.e. anion. We can denote it by Δ egH. Greater the amount of energy released in the above process, higher is the electron gain enthalpy of the element.

The electron gain enthalpy of an element is a measure of the firmness or strength with which an extra electron is bound to it. It is measured in electron volts per atom or kJ per mole. It can be an endothermic or exothermic reaction when you add an electron to the atom.

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