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Arrange the following ions in the increa...

Arrange the following ions in the increasing order of their size: `Be^(2+), CI^(-), S^(2-), Na^(+), Mg^(2+), Br^(-1)`?

Text Solution

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`{:(,"Ion", Be^(2+), Cl^(-),S^(2-),Na^(+),Mg^(2+),Br^(-)),(,"Valence shell",1,3,3,2,2,2):}`
Now, between `Na^(+) and Mg^(2+), ""(12)_Mg^(2+) lt ""11_Na^(+)` (Isoelectronic) also, between `Cl^(-) and S^(2-), ""(17)_Cl^(-) lt ""(16)S^(2-)` (isoelec tronic) because for iso-electronic species size decreases as the atomic number increases. Hence the order of increasing size is : `Be^(2+) lt Mg^(2+) lt Na^(2+) lt Cl lt S^(2-) lt Br^(-)`
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