Short Answer TypeAmong the following pairs of orbitals which orbital will experience the large effective nuclear charge? (i) 2s and 3s (ii) 4d and 4f (iii) 3d and 3p.
The unpaired electrons in Al and Si are present in 3p orbital. Which electrons will experience more effective nuclear charge from the nucleus ?
Long Answer TypeShort Answer TypeHow will you differentiate between s- and p-orbitals?
The difference between s- and p-orbitals:
| s-orbtial | p-orbital |
| 1. It is spherical in shape. | 1. It is dumb-bell in shape. |
| 2. It is non-directional in nature. | 2. It is directional in nature. |
| 3. The value of l = 0 | 3. The value of l = 1 |
4. It cannot participate in  bond formation. |
4. It can take part in bond formation. |
When there is a group of empty orbitals with equal energies (2px, 2py, 2pz), why are electrons first alloted singly to different orbitals ?
Long Answer TypeWrite the electronic configuration of elements from atomic number 11 to atomic number 20. Also name the elements.
Using the Aufbau principle, write the electronic configuration for the ground state of the following atoms:
(i) Boron (Z = 5)
(ii) Neon (Z = 10)
(iii) Al (Z = 13)
(iv) Chlorine (Z = 17)
(v) Calcium (Z = 20).
Short Answer TypeGive the electronic configuration of following ions:
(i) H- (ii) F- (iii) Mg2+ (iv) S2-
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