Energy and radius of first Bohr orbit of He+ and Li 2+ are [Given R H = 2.18 10 -18 J , a 0 = 52.9 pm ]

1. A. E n( Li 2+ ) = -8.72 10 -16 J ; r n( Li 2+ ) = 17.6 pm E n( He+ ) = -19.62 10 -16 J ; r n( He+ ) = 17.6 pm
2. B. E n( Li 2+ ) = -19.62 10 -18 J ; r n( Li 2+ ) = 17.6 pm E n( He+ ) = -8.72 10 -18 J ; r n( He+ ) = 26.4 pm
3. C. E n( Li 2+ ) = -8.72 10 -18 J ; r n( Li 2+ ) = 26.4 pm E n( He+ ) = -19.62 10 -18 J ; r n( He+ ) = 17.6 pm
4. D. E n( Li 2+ ) = -19.62 10 -16 J ; r n( Li 2+ ) = 17.6 pm E n( He+ ) = -8.72 10 -16 J ; r n( He+ ) = 26.4 pm

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