1.

Atoms more complicated than hydrogen have more than one proton in their nucleus. Let Z stands for the number of protons in a nucleus. Also imagine that an atom loses all but one of its electrons so that it changes into a positively charged ion with just one electron. Bohr.s formula for the energy levels of the hydrogen atom can easily be changed to apply to such ions. It becomes E_m = (-Z^2 e^4 m_e)/(8 epsi_0^2 h^2 n^2), where m= mass of electron , e= change of electron, n = orbit number. The ionization potential of Het in ground state is

Answer»

`2427 KJ MOL^(-1)`
`5249 kJ mol^(-1)`
`7116 kJ mol^(-1)`
`9811 kJ mol^(-1)`

ANSWER :A


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