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Which of the following principles/rules limits the maximum number of electrons in an orbital to two:
(1) Aufbau principle
(2) Pauli's exclusion principle
(3) Hund's rule of maximum multiplicity
(4) Heisenberg's uncertainty principle
Ans:Pauli's exclusion principle
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prove berzelius hypothesis
Correct statement is: (1) K=4s 1 , Cr= 3d 4 4s 2 , Cu= 3d 10 4s 2 (2) K=4s 2, Cr= 3d 4 4s 2 , Cu= 3d 10 4s 2 (3) K=4s 2 Cr= 3d 5 4s 1 , Cu= 3d 10
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Which of the following is isoelectronic with carbon atom: (1) Na + (2) Al +3 (3) O 2- (4)N + Ans: N +
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hardness of borewell water is less than that of seawater
GROUP 14: TIN AND LEAD Tin and lead give some resemblance to the lighter elements in group 14, especially Ge. Although they are uniquely more metallic in their physical and chem
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