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JEE Main/Advance
IMPORTANT
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4s orbital has lesser energy than 3d orbital because it has_____.

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Important Questions on Structure of Atom

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JEE Main/Advance
IMPORTANT
The magnetic moment of a divalent ion of an element with atomic number 24 in an aqueous solution is
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JEE Main/Advance
IMPORTANT
The set of quantum numbers that cannot be allotted to an electron in an atom is
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JEE Main/Advance
IMPORTANT
If the energy of an electron in the 1st and 2ndenergy levels of an H atom are -13.6eV  and -3.4 eV, respectively, the energy required in eV  to excite an electron from the 1st to the 2nd energy level is
 
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JEE Main/Advance
IMPORTANT
If λ0 and λ are the threshold wavelength and the wavelength of the incident light, respectively on a metal surface, the velocity of the photoelectron ejected from the metal surface is (me=mass of electron, h=Planck’s constant, c=speed of light)
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JEE Main/Advance
IMPORTANT
The energy of an electron in the first Bohr orbit is -13.6 eV. The energy of Be3+ in the first excited state is
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JEE Main/Advance
IMPORTANT
The de-Broglie wavelength of an object of mass 33 g moving with a velocity of 200 ms-1 is of the order of:
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JEE Main/Advance
IMPORTANT
Imagine that in any atom about 50% of the space is occupied by the atomic nucleus. If a silver foil is bombarded with α-particles, majority of the α-particles would
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JEE Main/Advance
IMPORTANT
For an electron whose x-positional uncertainty is 1.0×10-10 m, the uncertainty in the x. Component of the velocity in ms-1 will be of the order of