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CBSE - XI Science - Chemistry - Classification of Elements and Periodicity in Properties


Asked by 28th September 2009, 4:47 PM
Answered by Expert


Electron affinity is the enthalpy change when one electron is gained by an isolated gaseous atom in its valence shell.

X(g) + e-  X-(g)

Electronegativity is the tendency to pull a shared pair of electrons towards itself. It means that if there is a bond between two atoms, the electron pair which is shared to form the bond , how much is the tendency of each atom to pull the shared electron pair towards itself is electronegativity.


Answered by Expert 29th September 2009, 9:54 AM

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