. Consider the spectral line resulting from the transition n = 2  n = 1 in the atoms and ions given below. The shortest wavelength is produced by :

(a) hydrogen atom              (b) deuterium atom             (c) singly ionized helium     (d) doubly ionized lithium

Best Answer

Shortest wavelength will correspond to maximum energy. As value of atomic number (Z) increases, the energy in different energy states gets increased. Value of z is maximum for doubly ionised lithium atom (Z = 3) among the given elements. Hence, wavelength corresponding to this will be least. correct option is (d).

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