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Kinetic energy of electron in a mono electronic
species is +1312kJ/mole. Then which
of the following statements are correct
I) The electron is present in the 2nd orbit of He⁺ ion
II) The electron is present in the 2nd orbit of H atom
III) The electron is present in the 3rd orbit of Li⁺² ion
IV) The electron is present in the 4th orbit of He⁺ ion

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An Intiative by Sri Chaitanya

I and II

I and III

III and IV

II and III

answer is C.

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Detailed Solution

K.E = $\frac{1312 \times Z^{2}}{n^{2}} KJ / Mole$

Z =n

I) The electron is present in the 2nd orbit of He⁺ ion (Z=2 ,n =2 )

II) The electron is present in the 2nd orbit of H atom (Z=1 ,n =2 )

III) The electron is present in the 3rd orbit of Li⁺² ion (Z=3 ,n =3 )

IV) The electron is present in the 4th orbit of He⁺ ion (Z=3 ,n =3)

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