PYQSidePowered by
ExamsMy practice
Number of spectral lines obtained in He+ spectra, when an electron makes transition from fifth excited state to first excited state will be
10
Fifth excited state: n1 = 6 ; first excited state: n2 = 2
Number of lines = n( n + 1)2, where n = 6 - 2 = 4
⇒ 4 52 = 10
∵ the count depends only on the levels involved, not on Z
Answer: 10
The correct set of four quantum numbers for the valence electron of rubidium atom (Z=37) is :
Match List I with List II Choose the correct answer from the options given below:
The number of electrons present in all the completely filled subshells having n = 4 and s = + 12 is . (Where n = principal quantum number and s = spin quantum number)
Total number of ions from the following with noble gas configuration is . Sr2+ (z = 38), Cs+ (z = 55), La2+ (z = 57), Pb2+ (z = 82), Yb2+ (z = 70) and Fe2+ (z = 26)