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For a given value of quantum number l , the number of allowed values of is given by:
(1) l+2
(2) 2l+2
(3) 2l+ 1
(4) l + 1
Ans: 2l+ 1
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An element have atomic weight 40 and it's electronic configuration is 1s 2 , 2s 2 , 2p 6 , 3s 2 , 3p 6 . Then its atomic number and number of neutrons will be: (1) 18 and 22
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