Why electron gain enthalpy of F is less negative than that of Cl?

In fluorine, the new electron to be added goes to 2p-subshell while in chlorine, the added electron goes to 3p-subshell. As a result, the incoming electron does not feel much attraction from the nucleus and therefore, the electron gain enthalpy of F is less negative than that of Cl.

Why does Cl have more electron gain enthalpy than F?

It is due to small size of fluorine atom. As, there are strong inter electron repulsion in the relatively small 2P orbits of fluorine and thus, the incoming electron does not experience much attraction. Therefore chlorine has the electron gain enthalpy than the fluorine.

Which has more negative electron gain enthalpy F or Cl?

In F, the electron will be added to quantum level n = 2, but in Cl, the electron is added to quantum level n = 3. Therefore, there are less electron- electron repulsions in Cl and an additional electron can be accommodated easily. Hence, the electron gain enthalpy of Cl is more negative than that of F.

Which has highest electron gain enthalpy F or Cl?

But, chlorine is large in size and has comparatively low value of electronegativity than fluorine. Thus, it accepts an electron easily and has the highest electron gain enthalpy value.

Why fluorine has lower electron affinity than that of chlorine?

Electron affinity of fluorine is less than that of chlorine. Due to the smaller size and thus, the greater electron-electron repulsions, fluorine will not accept an incoming electron with the same as chlorine.

What is negative electron gain enthalpy?

Negative Electron Gain Enthalpy: It is represented by its negative values as the energy gets released, the halogen atoms gain stability by gaining electrons. As the halogens display a strong affinity to reach to the stable, noble gas state, the halogens have a higher negative electron gain enthalpy.

What is highest negative electron gain enthalpy?

chlorine
Hence chlorine has the highest value of negative electron gain enthalpy among all of these.

Which has lowest electron gain enthalpy?

Oxygen
Oxygen has the lowest negative electron gain enthalpy.

Which halogen has highest negative electron gain enthalpy?

Why does the electron affinity of fluorine have a negative value?

Electron affinity is the energy released when 1 mole of gaseous atoms each acquire an electron to form 1 mole of gaseous 1- ions. Fluorine has a negative value as energy is released when the electron is gained. This is because there is an attraction between the protons in the nucleus and the added electrons.

Why does fluorine have the highest electron affinity?

The incoming electron is going to be closer to the nucleus in fluorine than in any other of these elements, so you would expect a high value of electron affinity.