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He+ ion is a single electron species which resembles like hydrogen.
Therefore, the energies of the stationary states of hydrogen-like ions are given by the expression
En =( - 2.18 × 10-18 ) Z2 / n2 atom-1
Here n = 1and , Z = 2
En = (-2.18 X 10-18) 22/12
= 8.72 x 10-18 J
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