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Aufbau principle is obeyed in which of the following electronic configurations:
(1) 1s2 2s2 2p6
(2) 1s2 3p6 3s2
(3) 1s2 3s2 3p6
(4) 1s2 2s2 3s2
ans: 1s2 2s2 2p6
'Cohesive energy' : In a chemical bond, it is the energy needed to dissociate a solid into isolated atoms or molecules as appropriate.
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Neutrons are found in atoms of all elements except in: (1) Chlorine (2) Oxygen (3) Argon (4)Hydrogen Ans: Hydrogen
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