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Energy of first excited state in hydrogen atom is -3.4 eV, then kinetic energy of electron in same orbit of hydrogen atom is

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Important Questions on Structure of Atom

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The value of Planck's constant is 6.63×10-34Js. The velocity of light is 3.0×108 ms-1. Which value is closest to the wavelength in nanometers of a quantum of light with frequency of 8×1015s-1?
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The frequency of radiation emitted when the electron falls from n=4 ton=1 in a hydrogen atom will be (Given ionization energy of H=2.18×10-18J atom -1 and h=6.625×10-34Js)
HARD
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Among the following transition metal ions, the one set where all the metal ions have 3d2 electronic configuration is (Atomic numbers: Ti=22, V=23, Cr=24, Mn=25)
HARD
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The energy of second Bohr orbit of the hydrogen atom is -328 kJ mol-1, hence, the energy of the fourth Bohr orbit would be

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The uncertainty involved in the measurement of velocity of electron within a distance of 0.1 Å is

(Given: The mass of electron is 9.11×10-31 kg, Planck's constant is 6.626×10-34 J s)

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The orientation of an atomic orbital is governed by :
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Consider the following sets of quantum numbers:

       n l m s
(i) 3 0 0 +1/2
(ii) 2 2 1 +1/2
(iii) 4 3 -2 -1/2
(iv) 1 0 -1 -1/2
(v) 3 2 3 +1/2

Which of the following sets of quantum number is not possible?

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The uncertainty in the measurement of the position of an electron is associated with the uncertainty in the momentum, which is equal to 1×10-18 g cm s-1. The uncertainty in the electron velocity is (mass of an electron is 9×10-28 g)