What are isoelectronic ions? Account for the decrease in size of following species oxide ion > Fluoride ion > sodium ion > magnesium ion.

Atoms and ions having the same number of electrons are called isoelectronic species. (i) F– ion has 9 + 1 = 10 electrons. Thus, the species isoelectronic with it will also...

The size of an isoelectronic species increases with a decrease in the nuclear charge (Z). For example, the order of the increasing nuclear charge of F– , Ne, and Na+...

(i) Sodium oxide                 → Na2O  (ii) Aluminium chloride       → AlCl3  (iii) Sodium suphide           → Na2S  (iv) Magnesium hydroxide → Mg(OH)2

Number of moles 12 / 24 = 0.5 mol 

A Mg2+ ion and Mg atom differ by two electrons.  103 moles of Mg2+ and Mg atoms would differ by  103 × 2 moles of electrons  Mass of 2 ×103 moles of electrons...

(a) : Isoelectronic species are those which have same number of electrons. K+ = 19 – 1 = 18 ; Ca2+ = 20 – 2 = 18 Sc3+ = 21 – 3...

(a) : K+ = 19 – 1 = 18e– Cl– = 17 + 1 = 18e– Ca2+ = 20 – 2 = 18e– Sc3+ = 21 – 3 = 18e– Thus all the species...

(b) : The stability of the carbonates of the alkaline earth metals increases on moving down the group. The solubility of carbonate of metals in water is generally low. However...

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