Question

The ionization energy of a hydrogen atom is 13.6 eV. The energy of the ground level in doubly ionized lithium is:

A

-28.7 eV

B

-54.4 eV

C

-122.4 eV

D

-13.6 eV

Medium
Solution
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Correct option is C)

Bohr's model is used to solve this question,
According to this  

So, in this the E is equal to energy of electron in shell of atom whose atomic number is Z

Now, same amount of energy with opposite sign must be given to electron in order to remove it.    (As n=1)

 Since for Lithium, Z=3 

Therefore, you get

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