In hydrogen atom the electronic transition from n= ∞ to n=1 corresponds to largest energy emission.
Electronic transition is the jump of an electron from one energy level to another energy level .
E = hc/λ
h= plank constant =6.62*10^(-34)
c=speed of light
λ= wavelength of emited electron .
Thus , we can conclude that the electronic transition from infinity to n=1 (ground state) corresponds to largest energy emission .
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