1.

The shortest wavelength of the spectrum line is that of electron being transits into atom to ion from n = 2 to n = 1 for .......

Answer»

hydrogen atom
deuterium atom
singly ionized helium
doubly ionized lithium

Solution :doubly ionized lithium
`(1)/(lamda)=RZ^(2)[(1)/(n_(f)^(2))-(1)/(n_(i)^(2))]`
R and `(1)/(n_(f)^(2))-(1)/(n_(f)^(2))` are constant
`:.(1)/(lamda)propZ^(2)`
and Z = 3 is maximum for doubly ionized lithium in a given atom.


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