The electrons, identified by quantum number n and l i. `n = 4,l=1` ii. `n = 4, l= 0` iii. `n = 3 , l= 2 ` iv. `n= 3 , l = 1` Can be palced in the order of increasing energy from the lowest to highest,itsA. `(iv) lt (ii) lt (iii) lt (i)`B. `(ii) lt (iv) lt (i) lt (iii)`C. `(i) lt (iii) lt (ii) lt (iv)`D. `(iii) lt (i) lt (iv) lt (ii)`

The electrons, identified by quantum number n and l i. `n = 4,l=1` ii.

1.	The electrons, identified by quantum number n and l i. `n = 4,l=1` ii. `n = 4, l= 0` iii. `n = 3 , l= 2 ` iv. `n= 3 , l = 1` Can be palced in the order of increasing energy from the lowest to highest,itsA. `(iv) lt (ii) lt (iii) lt (i)`B. `(ii) lt (iv) lt (i) lt (iii)`C. `(i) lt (iii) lt (ii) lt (iv)`D. `(iii) lt (i) lt (iv) lt (ii)`
Answer» Correct Answer - A (a) The two guiding rules to arrange the various orbitals in the increasing energy are : (i) Energy of an orbital increases with increase in the value of `n + 1` (ii) Of orbitals having the same value of `n +1`, the orbital with lower value of `n` has lower energy. Thus for the given orbitals, we have (i) `n + 1 = 4 + 1 = 5` (ii) `n + 1 = 4 + 0 = 4` (iii) `n + 1 = 3 + 2 = 5` (iv) `n + 1 = 3 + 1 = 4` Hence, the order of increasing energy is. `(iv) lt (ii) lt (iii) lt (i)`.

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