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Give reasons: (i) IE(1) of sodium is...

Give reasons:
(i) `IE_(1)` of sodium is lower than that of magnesium whereas `IE_(2)` of sodium is higher than that of magnesium.
(ii) Noble gases have positive value of electron gain enthalpy.

Text Solution

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(i) The effective nuclear charge of magnesium is higher than that of sodium. For these reasons, the energy required to remove an electron from magnesium is more than the energy required in sodium. Hence, the first ionization enthalpy of sodium is lower than that of magnesium
(ii) Noble gases have completely filled electronic configuration and they are more stable. So in Noble gases addition of electron is not possible. Electron gain enthalpy is always the amount of energy released (-ve sign) when an electron is added to an atom.
But in noble gases, if an electron is added, they have positive value of electron gain enthalpy.
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FULL MARKS-PERIODIC CLASSIFICATION OF ELEMENTS -Additional Questions(3 MARK QUESTIONS)
  1. Arrange Na^(+),Mg^(2+) and Al^(3+) in the increasing order of ionic ra...

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  2. Arrange the ions F^(-),O^(2-) and N^(3-) in the increasing order of th...

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  3. Mention some characteristics of ionization energy.

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  4. Why ionization energy and electron affinity are calculated in gaseous ...

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  5. How does the shielding effect caused by inner electrons affect the ion...

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  6. Ionization energy of Mg is greater than that of Al. Why?

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  7. What are factors which influence the electron gain enthalpy ?

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  8. Give the general variation of electron gain enthalpies in the periodic...

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  9. Explain about the electronegativity and non-metallic character across ...

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  10. Prove that valency is a periodic property.

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  11. Write a note about periodic trends and chemical reactivity.

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  12. Why the first ionisation enthalphy of sodium is lower than that of mag...

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  13. What are the various factors due to which the ionization enthalpy of t...

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  14. Which of the following pairs of elements would have more negative elec...

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  15. Would you expect the second electron gain enthalpy of O as positive, m...

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  16. What are major differences between metals and non-metals?

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  17. The increasing order of reactivity among group 1 elements is Li< Na< ...

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  18. Arrange the following as stated: (i) N(2),O(2),F(2),CI(2), (Increasing...

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  19. Why the first ionisation enthalphy of sodium is lower than that of mag...

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  20. Give reasons: (i) IE(1) of sodium is lower than that of magnesium ...

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