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Karnataka Board PUCPUC Science Class 11

In which of the following pairs, the ions are iso-electronic? (i) NaX+,MgX2+ (ii) AlX3X+,OX− (iii) NaX+,OX2X− (iv) NX3X−,ClX−

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Question

In which of the following pairs, the ions are iso-electronic?

(i) \[\ce{Na^{+}, Mg^{2+}}\]

(ii) \[\ce{Al3^{+}, O-}\]

(iii) \[\ce{Na+ , O2-}\]

(iv) \[\ce{N3-, Cl-}\]

Short/Brief Note
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Solution

(i) \[\ce{Na^{+}, Mg^{2+}}\]

(iii) \[\ce{Na+ , O2-}\]

Explanation:

Isoelectronic species are those species that possess the same number of electrons.

Here both  \[\ce{Na+, Mg^{2+}}\] possess 10 electrons and both \[\ce{Na+ , O2-}\] possess 10 electrons.

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Chapter 2: Structure of Atom - Multiple Choice Questions (Type - I) [Page 18]

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NCERT Exemplar Chemistry [English] Class 11
Chapter 2 Structure of Atom
Multiple Choice Questions (Type - I) | Q 20 | Page 18

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