Practice free Atomic Structure (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which is not true with respect to cathode rays?
Cathode rays are a stream of electrons emitted from the cathode of a vacuum tube. They are charged particles that can be deflected by electric or magnetic fields. However, they do not move with the speed of light, which is the maximum possible speed in the universe.
In hydrogen atom, energy of first excited state is -3·4 eV. Find out the K.E. of the same orbit of hydrogen atom
K.E. of e- in nth orbit = - $E_n$ = 3.4 e.V
The energy of the first electron in helium will be
$ E_n = - { 13.6 \over n^2 } Z^2 e.V $
In the Bohr’s orbit, what is the ratio of total kinetic energy and total energy of the electron
$ K.E = { 1 \over 2 } mv ^2 P.E = - { Ze^2 \over r } $ Electrostatic force = centrifugal force $ { Ze^2 \over r^2 } = {mv^2 \over r } \therefore P.E = -mv^2 $ $ Total energy = K.E + P.E = { 1 \over 2 } mv^2 - mv^2 = -{ 1 \over 2 }mv^2 \therefore { K.E \over Total Energy } = -1 $
In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inter-orbit jumps of the electron for Bohr orbits in an atom of hydrogen ?
The orbital angular momentum for an electron revolving in an orbit is given by $ \sqrt { l ( l+1 )} . { h \over 2 \pi } $ This momentum for an s-electron will be given by
The orbital angular momentum for an electron is given by √[l(l+1)] ħ/2π, where l is the orbital angular momentum quantum number. For an s-electron, l=0, so √[l(l+1)] becomes 0, and the orbital angular momentum is zero.
The emission spectrum of hydrogen is found to satisfy the expression for the energy change “E (in Joules) such that $ “E = 2·18 \times 10^{–18} J where n_1 = 1,2, 3 ..........and n_2 = 2,3 ,4 $ The spectral lines correspond to Paschen series it
Among the following series of transition metal ions, the one where all metal ions have same 3d electronic configuration is
For d-electron, the orbital angular momentum is
Where the value of l for d orbital is 2
Time taken for an electron to complete one revolution in the Bohr orbit of hydrogen atom is
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