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11th Class Chemistry Classification of Elements and Periodicity in Properties / तत्त्वों का वर्गीकरण एवं गुणों में आवर्ति Question Bank 11th CBSE Chemistry Classification of Elements and Periodicity in Properties

  • question_answer
    Arrange the following ions in order of decreasing ionic radii: \[L{{i}^{2+}},\,H{{e}^{+}},\,B{{e}^{3+}}\].

    Answer:

                    \[H{{e}^{+}},\,L{{i}^{2+}}\]and \[B{{e}^{3+}}\] are all isoelectronic ions. Among isoelectronic ions, ionic radius decreases as the positive charge increases. Therefore, the ionic radii decrease in the order: \[H{{e}^{+}}>L{{i}^{2+}}>B{{e}^{3+}}\].


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