Why electron gain enthalpy of fluorine is less than chlorine?

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 bond dissociation enthalpy of chlorine is greater than fluorine?

The bond energy of chlorine is more than the bond energy of fluorine. This is due to the fact that the size of the fluorine atoms is very small, and the electrons on the fluorine atom repel each other due to which the bonds become weaker and the bond energy decreases. The repulsion in the fluorine atoms is very high.

Why the bond enthalpy of f2 is less than that of cl2?

(a)(i) F atom is small in size and due to this the electron-electron repulsions between the lone pairs of F-F are very large. Thus, the bond dissociation energy of F2 is lower than that of Cl2.

Why is the standard enthalpy change of atomisation of chlorine half the bond energy?

The standard enthalpy of atomization is half as the standard enthalpy of the the bond dissociation because atomization includes the conversions of molecules into atomic form which take half a mole and the standard enthalpy of the reaction deals with a complete mole so standard enthalpy of atomization is half than the …

Why is fluorine more negative than chlorine?

Complete answer: Electron gain enthalpy is the amount of energy released when an electron is added in the shell of an atom. The element in whose shell the electron gets easily added has more negative electron gain enthalpy. Thus, the electron gain enthalpy of chlorine is more negative than that of fluorine.

Why does chlorine have a higher electron gain enthalpy than fluorine?

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.

Why does fluorine have a weaker bond strength than chlorine?

Bond dissociation energy of fluorine molecule is much less than that of chlorine molecule. This is because, in fluorine molecule, two fluorine atoms are quite close together (i.e. F-F bond length is very short) due to full size of fluorine atoms. The F-F bond, therefore, becomes weak.

Is F2 bond stronger than Cl2?

Bond dissociation energy of F2 is less than Cl2 .

Why does enthalpy of atomisation decrease down a group?

Enthalpy of atomisation depend upon the number of unpaired electron more is unpaired electron more is enthalpy of atomisation. Upto the middle of the series, the number of unpaired electrons increases and then decreases due to their pairing.

What is the enthalpy change of atomisation of chlorine?

+122
The +122 is the atomization enthalpy of chlorine. Again, we have to produce gaseous atoms so that we can use the next stage in the cycle. The -349 is the first electron affinity of chlorine. Remember that first electron affinities go from gaseous atoms to gaseous singly charged negative ions.