Ncert Exercises & Solutions

The Balmer series in the hydrogen spectrum corresponds to the transition from $n_{1} = 2 to n_{2} = 3, 4, . . . . .$ This series lies in the visible region. Calculate the wave number of line associated with the transition in Balmer series when the electron moves to n=4 orbit.

$(R_{H} = 109677 {cm}^{- 1})$

Configurations either exactly half-filled or fully filled orbitals are more stable due to symmetrical distribution of electrons and maximum exchange energy. In

3 d^{10} 4 s^{1}

, d-orbitals are completely filled and s-orbital is half-filled. Hence, it is more stable configuration.

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