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The maximum number of electrons which each sub-shell can occupy is:
(1) 2n2
(2) 2n
(3) 2 (2l+1)
(4) (2l+1)
Ans: 2(2l+1)
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The present atomic weight scale is based on: (1) C 12 (2) O 16 (3) H 1 (4)C 13 Ans: C 12
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Q. in radioactive decay, a nucleus emits an alpha particle and two beta particle successively. show that the final nucleus is an isotope of original nucleus. Ans: Let the mass and
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