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Solve! Which one of the following sets of ions represents a collection of isoelectronic species?

Which one of the following sets of ions represents a collection of isoelectronic species?

  • Option 1)

    K^{+},Cl^{-},Ca^{2+},Sc^{3+}\;

  • Option 2)

    \; Ba^{2+},Sr^{2+},K^{+},S^{2-}\;

  • Option 3)

    \; N^{3-},O^{2-},F^{-},S^{2-}\; \;

  • Option 4)

    \; Li^{+},Na^{+},Mg^{2+},Ca^{2+}

 
Answers (1)
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As we leant in

Isoelectronic species -

A series of atom, ions and molecules in which each species contains the same number of electrons but different nuclear charge.

- wherein

e.g.\:\:N^{3-},O^{2-},F^{-},Ne,Na^{+},Mg^{2+},Al^{3+}

 

 Let's state the number of electrons in each ion:

K+ : 18          Ba2+ : 54           N3- : 10          Li: 2

Cl- : 18          Sr2+ : 36           O2 : 10           Na+ : 10

Ca2+ : 18       K+ : 18              F- : 10            Mg2+ : 10

Sc3+ : 18        S2- : 18            S2- : 18           Ca2+ : 18


Option 1)

K^{+},Cl^{-},Ca^{2+},Sc^{3+}\;

This option is correct.

Option 2)

\; Ba^{2+},Sr^{2+},K^{+},S^{2-}\;

This option is incorrect.

Option 3)

\; N^{3-},O^{2-},F^{-},S^{2-}\; \;

This option is incorrect.

Option 4)

\; Li^{+},Na^{+},Mg^{2+},Ca^{2+}

This option is incorrect.

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