The correct order of Ionisation Enthalpy is -

Options

A. `C gt Si gt Ge gt Sn gt Pn`
B. `C gt Ge gt Si gt Pb gt Sn`
C. `CgtGegt Si gt Pb gt Sn`
D. `C gt Si gt Ge gt Pb gt Sn`

Answer

C

Explanation

`1.090 xx 10^(6)ms^(-1)=2.18 xx 10^(6)xx(3)/((n+1))`
`n^(th)=5^(th),n^(th)` excited state = 6 orbit
no. of spectral lines = 6 - 2 = 4