Home
Class 12
CHEMISTRY
The energy and radius of electron presen...

The energy and radius of electron present in second orbit of `He^+` respectively are

A

`-2.18 times 10^-18 J, 105.8 pm`

B

`-4.36 times 10^-18 J, 52.9 pm`

C

`-1.09 times 10^-18 J, 105.8 pm`

D

`-8.72 times 10^-18 J, 211.6 pm`

Text Solution

Verified by Experts

The correct Answer is:
A
Answer(1) Energy of an electron, `E_n = -13.6 z^2/n^2 eV`
For He atom, Z = 2 .
` E_n = -13.6 (2)^2/(2)^2 eV` .
= `-13.6 (1.6 xx 10^-19J) [because 1eV = 1.6 xx 10^-19J]` .
`therefore "Energy", E_n = -2.18 xx 10^-18 J`.
Radius of an electron, r = `0.529 xx n^2/ z A^@` .
= `0.529 xx (2^2)/1 xx 10^2 pm` .
[`therefore 1A^@ = 10^2 pm`] .
`therefore Radius, r = 105.8pm`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • EAMCET -2016 (TS)

    SIA PUBLICATION|Exercise CHEMISTRY|4 Videos

  • EAMCET-2019 (TS) SHIFT-1

    SIA PUBLICATION|Exercise CHEMISTRY|30 Videos

Similar Questions

Explore conceptually related problems

The energy of an electron present in Bohr's second orbit of hydrogen atom is

The energy of an electron present in Bohr.s second orbit of hydrogen atom is

Knowledge Check

  • The number of electrons present in outer most orbit of an atom is called …………… electrons.

    A
    valency
    B
    paried
    C
    unpaired
    D
    love pair

  • Maximum number of electrons may be present in one 4f-orbital

    A
    2
    B
    4
    C
    7
    D
    14

  • What would be the radius of second orbit of He^(+) ion ?

    A
    `1.058 A^(@)`
    B
    `3.023 A^(@)`
    C
    `2.068 A^(@)`
    D
    `4.458 A^(@)`

    • Similar Questions

    Explore conceptually related problems

    Find the kinetic energy, potential energy and total energy in first and second orbit of hydrogen atom if potential energy in first orbit is taken to be zero.

    The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is [ a_(0) is Bohr radius]

    The energy of an electron in the 3rd orbit of H- atom ( in J ) is approximately.

    The total number of electrons present in all the 's' orbitals, all the 'p' ortitals and all the 'd' orbitals of cesium ion are respectively

    The radius of the second Bohr orbit is

    Home
    Profile