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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 Properties2 Marks
Question
Element 'Al' belongs to group 13 forms ionic compounds. Write,
  1. Formula of its oxide.
  2. Arrange the following in decreasing order of electropositive character Li, Na, K, Cs Give reason.
✓

Answer

  1. Al2O3 is formula of its oxide.
  2. Cs > K > Na > Li because tendency to lose electron decreases due to decrease in atomic size and increase in effective nuclear charge.

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