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PART - 1 CH - 3 Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryPART - 1 CH - 3 Classification of Elements and Periodicity in Properties2 Marks
Question
Answer the following questions.
(i) Why group 1 elements form $M ^{+1}$ instead of $M ^{+2} ?$
(ii) Why second group elements form $M ^{+2}$ instead of $M ^{+1}$ ?
✓

Answer

(i) From first group elements (alkali metals) the difference between II and I ionization enthalpy is more than 16 eV . Hence, their lower oxidation state is more stable. Hence, they form $M ^{+1}$ not $M ^{+2}$.
(ii) The difference between II and I ionization enthalpy of second group is less than 11 eV . Hence their higher oxidation state is more stable and they form $M ^{+2}$ not $M ^{+1}$

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