Consider thefollowingspecies . N^(3-), O^(2-) , F^(-) Na^(+) Mg^(2+) and A1^(3+) (i)What iscommonin them ? (ii) Arrange them in orderof increasingionicradii ?

Consider thefollowingspecies . N^(3-), O^(2-) , F^(-) Na^(+) Mg^(2+) a

1.	Consider thefollowingspecies . N^(3-), O^(2-) , F^(-) Na^(+) Mg^(2+) and A1^(3+) (i)What iscommonin them ? (ii) Arrange them in orderof increasingionicradii ?
Answer» Solution : (a) Eachone ofthesecontains10 electronsand henceall areisoelectronicions. (b) Theionicradii ofisoelectronic ionsdecrease with theincrease in themagnitudeof thenuclear charge.Forexample considerthe ISOELECTRONIC ions `: N^(3-) , O^(2-), F^(-) , Na^(+) , MG^(2+)` and `A1^(3+)` . Alltheseions have 10electrons but theirnuclear charges increases in theorder : `N^(3-) (+7) ,O^(2-) (+8) , F^(-) (+9) ,Na^(+) (+11) , Mg^(2+) (+12) ` and `A1^(3+) (+13). ` Therefore, theirionicradii decrease in the order`: N^(3+) O^(2-) gt F^(-) gt Na^(+) gt Mg^(2+) A1^(3+)`