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For the energy levels in an atom, which one of the following statements is correct:
(1) There are seven principal electron energy levels
(2) The second principal energy level can have four sub-energy levels and contains a maximum of eight electrons
(3) The energy level can have maximum of 32 electrons
(4) The sub-energy level is at a higher energy than the sub-energy level
Ans: The second principal energy level can have four sub-energy levels and contains a maximum of eight electrons
The equation Δ x Δp ≥ h/ 4Π shows: (1) de-Broglie relation (2) Heisenberg's uncertainty principle (3) Aufbau principle (4) Hund's rule ans: Heisenberg'
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Which set of quantum numbers are not possible from the following: (1) n=3, l= 2, m=0, s= -1/2 (2) n=3, l= 2, m=-2 s= -1/2 (3) n=3, l= 3, m=-3,
The number of electrons in [ 40 19 k ] -1 is: (1) 19 (2) 20 (3)18 (4)40 Ans: 40
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Number of unpaired electrons in inert gas is: (1) Zero (2) 8 (3) 4 (4) 18 Ans: Zero
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