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Energy required for the electron excitat...

Energy required for the electron excitation in `Li^(++)` from the first to the third Bohr orbit is :

A

36.3 eV

B

108.8 eV

C

122.4 eV

D

12.1 eV

Text Solution

Verified by Experts

The correct Answer is:
B
`E_(n)=-13.6(Z^(2))/(n^(2)) `
`E_(L^(++))=-13.6xx(9)/(1)=-122.4eV`
`E_(L^(++))=-13.6(9)/(9)=-136eV`
`Delta=-13.6-(-122.4)`
`=108.8eV`
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Knowledge Check

  • A doubly ionised lithium atom is H_2 -like with atomic no. 3. It is excited to produce radiations, Wavelength of radiations required to excite the electron in Li^(++) from the Ist to Illrd Bohr orbit is

    A
    101.21Å
    B
    202.42Å
    C
    303.63Å
    D
    113.71Å

  • The ratio of radii of the first three Bohr orbits is :

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    `1:2:3`
    B
    `1:4:9`
    C
    `1:9: 27`
    D
    `1: sqrt(2) : sqrt( 3)`

  • The ratio of radii of the first three Bohr orbits of H-atom is :

    A
    `1:2:3`
    B
    `1:4:9`
    C
    `1:3:27`
    D
    `1:sqrt(2):sqrt(3)`

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