Structure of Atom - Result Question 17

####17. According to Bohr’s theory the energy required for an electron in the Li2+ ion to be emitted from n=2 state is (given that the ground state ionization energy of hydrogen atom is 13.6eV )

(a) 61.2eV

(b) 13.6eV

(c) 30.6eV

(d) 10.2eV

[1999]

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Solution:

  1. (c) Energy of electron in 2nd orbit of Li+2

=13.6Z2n2

=13.6×(3)2(2)2=30.6eV

Energy required =0(30.6)=30.6eV



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