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How can you calculate electron affinity of a atom in a easy ways ?
The ability of an atom or molecule to form a negative ion, expressed as the energy released when an electron is attached. Symbol: A
or

The electron affinity of an element is the energy given off when a neutral atom in the gas phase gains an extra electron to form a negatively charged ion.
          Eg:A fluorine atom in the gas phase, gives off energy when it gains an electron to form a fluoride ion.


EA increases from left to right on a period and decreases from top to bottom on a periodic table.


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