1.

If n 3,(A) 10, 110, m 0 then the possible atomic number may be(C) 12, 13(B) 11, 12(D) 13, 14

Answer»

n = 3 ... means 3rd orbit L = 0 , means S subshell

so, 3S can have either 1 or 2 electrons

=> 1s2 , 2s2, 2p6 = 10 electrons 3s1/3s2 = 1 or 2 electrons

so , the atomic numbers can be 10+1 , 10+2 = 11,12

option B


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