Question

If doubly ionised lithium atom is hydrogen-like with atomic number 3, the wavelength of radiation required to excite the electron in Li⁺⁺ from the first to the third Bhor orbit and the number of different spectral lines observed in the emission spectrum of the above excited system are –

• A. 296 Å, 6
• B. 114 Å, 3
• C. 1026 Å, 6
• D. 8208 Å, 3

Answer 1

Answer: (B)

114 Å, 3

Answer 2

$\frac{1}{\lambda}$ = RZ² $\left\lbrack \frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}} \right\rbrack$