# Which is the correct order of increasing energy of the listed orbitals in the atom of titanium ?(At. no. Z = 22) Option 1) 3s 4s 3p 3d Option 2) 4s 3s 3p 3d Option 3) 3s 3p 3d 4s Option 4) 3s 3p 4s 3d

Electronic configuration of d block elements -

These elements have other electronic configuration of

-

correct order is

Option 1)

3s 4s 3p 3d

This option is incorrect

Option 2)

4s 3s 3p 3d

This option is incorrect

Option 3)

3s 3p 3d 4s

This option is incorrect

Option 4)

3s 3p 4s 3d

This option is correct

According to afbau rule..

The higher the value of n+L the higher the energy.., if they have same n+L value.. The lower n value  orbital  has less energy..

In the above options.. n+L values as follows..

3s = 3+0 = 3

4s = 4+0 = 4

3d = 3+2 = 5

3p = 3+1 = 4

So, the correct order of increasing energy is  3s < 3p < 4s < 3d..

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