Question

# A single electron is revolving orbits a round nucleus a stationary (z = 5). The energy required to excite the electron from the third to the fourth Bohr orbit will be:

A
4.5 eV
B
8.53 eV
C
25 eV
D
16.53 eV

Solution

## The correct option is C 16.53 eV$$\displaystyle \Delta E=E_{4}-E_{3}$$$$\displaystyle =-\frac{13.6\times Z^{2}}{16}+\frac{13.6\times Z^{2}}{9}$$= $$\displaystyle -13.6\times 25\left [ \frac{-1}{9}+\frac{1}{16} \right ]=16.5$$ eVChemistry

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