For what electron gain enthalpy is the most negative?

Electron gain enthalpy generally becomes more negative across a period as we move from left to right.

Explanation

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. The electron gain enthalpy of an element is a measure of the firmness or strength with which an extra electron is bound.

  • Halogens have the highest negative value of electron gain enthalpy.
  • Energy is released when an electron is added to the atom. Therefore, the electron gain enthalpy is negative.
  • Noble gases have large positive electron gain enthalpy. This is because the extra electron is placed in the next higher principal quantum energy levels.
  • As we move down a group, both the atomic size and the nuclear charge increases. But the effect of the increase in atomic size is much more pronounced than the nuclear charge.
  • With the increase in atomic size, the attraction of the nucleus for the incoming electron decreases.

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