Can someone help me answer this??????? The electron affinity of lithium is a neg

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Can someone help me answer this???????
The electron affinity of lithium is a negative value, whereasthe electron affinity of beryllium is a positive value. Useelectron configurations to account for this observation.
It is like a littleessay question but I don't know where to start. I'll rate thehighest!
The electron affinity of lithium is a negative value, whereasthe electron affinity of beryllium is a positive value. Useelectron configurations to account for this observation.
It is like a littleessay question but I don't know where to start. I'll rate thehighest!

Explanation / Answer

Electron Affinity is negative means, energy is released during addition of electron and it is positive means, energy is absorbed during this process.

In case of Lithium, addtion of electron will be easy as the electronic configuration is [He]1s1.

Whereas in case of beryllium, it is not easy to add electron as it electronic configuration is stable due to completely filled s orbital i.e., [He]1s2. Hence energy is to be supplied to add electron

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