Find ratio of ionisation energy of Bohr's hydrogen atom and hydrogen like lithium atom .

Atomic no. of hydrogen ZH =1
Atomic no. of hydrogen like lithium(Li++)  ZLi = 3

(I) ionisation energy is given by :- -13.6*Z2/n2 ------- (1)

IH​/ILi 13.6*113.6*3*3

         =   1/9

ration of ionization energy of hydrogen atom and hydroge like lithium atom is 1:9

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