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Why does in the building of an atom, th...

Why does in the building of an atom, the filling of 4s orbital takes place before filling in 3d orbital ?

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(i) Principal quantum number.
(ii) degenerate
(iii) Two, three
(iv) spherical
(v) half-filled and completely
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Assertion : Ionisation of transition metals involves loss of ns electron before (n - 1)d electrons. Reason : Filling of ns-orbitals takes placed before (n - 1)d orbitals.

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While filling up of electrons in the atomic orbitals, the 4s orbital is filled before the 3d orbital but reverse happens during the ionisation of the atom. Explain why?

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Assertion : In transition elements radii of 5d series are virtually the same as those of the corresponding members of 4d series. Reason : The filling of 4f orbitals before 5d orbitals results in regular decrease in atomic radii.

MODERN PUBLICATION-STRUCTURE OF ATOM-Revision Exercises (Short Answer Questions)
  1. Compare the shapes of 1s- and 2s-orbitals.

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  2. What is the difference between the notations l and L ?

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  3. How many electrons are there in the valence quantum level of copper (a...

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  4. Write the electronic configuration of the following elements : Carbo...

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  5. Identify the atoms that have the following ground state electronic con...

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  6. Why does in the building of an atom, the filling of 4s orbital takes...

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  7. The electronic configuration of copper is [Ar] 4s^(1) 3d^(10) and not...

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  8. An atom of an element has 19 electrons. Find out : (a) its atomic n...

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  9. Define atomic orbital. Give the shapes of s and p orbitals.

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  10. What is Hund's rule of maximum multiplicity ? Illustrate this by takin...

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  11. Half-filled and fully-filled orbital orbitals are more stable

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  12. What is Aufbau principle ? Write the electroni configurations of the e...

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  13. Draw the shape of an orbital which has l = 0.

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  14. State Aufbua principle. Write electronic configurations of the element...

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  15. Why does in the building of an atom, the filling of 4s orbital takes...

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  16. State and explain Pauli's exclusion principle. Write the electronic co...

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  17. What is Hund's rule of maximum multiplicity ? Explain by taking examp...

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  18. The magnetic quantum number specifies.

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  19. What is the experimental evidence in support of the diea that electron...

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  20. The effect of uncertainty principle is significant only for motion of ...

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