Q.

The ground state energy in J, of hydrogen atom is –X. The minimum energy in J, required to promote an electron from n = 1 to n = 2 in He+ is

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a

3X

b

4X/3

c

3X/4

d

X/3

answer is A.

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Detailed Solution

;  given E1 = X......(1)for He+ ion Z = 2∆E ; energy absorbed for the electronic transition 1 → 2
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