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Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryClassification of Elements and Periodicity in Properties3 Marks
Question
  1. Write the general electronic configuration of Group 17 elements.
  2. What is the oxidation state and covalency of Al in [AlCl(H2O)5]2+?
  3. Which out of the following will have the most negative electron gain enthalpy and which have the least negative?

P, S, Cl and F.

✓

Answer

  1. ns2 np5 is the general electronic configuration of Group 17.
  2. The oxidation state of Al in is +3,

x - 1 + 0 = +2

x = +3

The covalency of 'Al' is 6.

  1. Across a period, electron gain enthalpy becomes more negative as we move from left to right. In case of Cl, n = 3, added electron occupies a larger region of space and electron-electron repulsion is much less. So, it has higher negative value. Therefore, 'Cl' has highest negative electron gain enthalpy and 'P' has least negative electron gain enthalpy.

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