Question

Calculate the 1st excitation energy of electon in H-atom and Ioinzation energy of H-atom.

Answer 1

Answer:. excitation energy = - 10.2 ev

ionisation energy = 13.6 ev

Explanation:

energy E = - 13.6 [ 1/n2]

for first excitation the electron goes from n=1 to n=2 shell.

hence 1/n2 = [ 1/1 - 1/4 ] = 3/4

first excitation energy = -13.6 x 3 / 4 = = 10.2 ev

Ionisation energy of hydrogen atom

for Z=1 we get = 13.6 electron volt