Questions

If doubly ionized lithium atom is hydrogen like with atomic number 3, the wavelength of radiation required to excite the electron in $L i^{+ +}$ from the first to the third Bohr orbit and the number of different spectral lines observed in the emission spectrum of the above excited system are

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296 Å, 6

114 Å, 3

1026 Å, 6

8208 Å, 3

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detailed solution

Correct option is B

energy required E= Z2x13.6112-132 =9 x13.6 x89 =108.8 eV corresponding wavelength 12400108.8=114A0 from third level 3 transition is only possible

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