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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
Among the elements B, Al, C and Si:
  1. Which element has the highest first ionisation enthalpy?
  2. Which element has the most metallic character? Justify your answer in each case.
✓

Answer

Arranging the elements into different groups and periods:
Group
13
14
Period 2
B
C
Period 3
Al
Si
  • Ionization enthalpy increases along a period and decreases down a group. Therefore, C has the highest first ionization enthalpy.
  • Metallic character decreases along a period and increases down a group. Therefore, Al has the most metallic character.

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