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

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryClassification of Elements and Periodicity in Properties2 Marks
Question
i. Which is largest in size $\mathrm{Cu}^{+}, \mathrm{Cu}^{2+}$ or Cu , and why?
ii. Which element in periodic table has highest I.E. (ionisation energy)?
iii. Which element is more metallic-Mg or Al and why?
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Answer

  1. Cu is largest due to less effective nuclear charge. It has 29 electrons, 29 protons, $\mathrm{Cu}^{+}$has 28 electrons and 29 protons, $\mathrm{Cu}^{2+}$ has 27 electrons and 29 protons.
  2. He has highest ionisation energy because its outermost shell is completely full and most stable.
  3. Mg is more metallic due to lower ionisation energy.

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