For the energy levels in an atom, which one of the following statement

1.	For the energy levels in an atom, which one of the following statement(s) is (are) correct ?
Answer» There are seven principal electron energy levels The second principal energy level can have FOUR sub-energy levels and contain a maximum of eight electrons The M energy level can have a maximum of 32 electrons The 4s sub-energy level is at a lower energy than the 3d sub-energy level. Solution :a) and d) are TRUE. b) is wrong because for m = 2. l=0 ,1(two sub-energy levels). c) is wrong because M shell means N =3 . Maximum electrons it can have = `2n^2= 2 xx 3^2 = 18`

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