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 TypeWhen 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.
Electronic configuration of the element from atomic number 11 to 20.
|
Element |
Atomic number (Z) |
Electronic configuration |
|
Sodium (Na) |
11 |
[Ne]10 3s1 |
|
Magnesium (Mg) |
12 |
[Ne]10 3s2 |
|
Aluminium (Al) |
13 |
[Ne]10 3s2 3p1 |
|
Silicon (Si) |
14 |
[Ne]10 3s2 3p2 |
|
Phosphorus (P) |
15 |
[Ne]10 3s2 3p3 |
|
Sulphur (S) |
16 |
[Ne]10 3s2 3p4 |
|
Chlorine (Cl) |
17 |
[Ne]10 3s2 3p5 |
|
Argon (Ar) |
18 |
[Ne]10 3s2 3p6 |
|
Potassium (K) |
19 |
[Ar]10 4s1 |
|
Calcium (Ca) |
20 |
[Ar]10 4s2 |
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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