" 6.Among `F^(-)`,`0^(2-)`, `Na^(+)` and `Mg^(2+)` which is bigger? Why? "

The ionic radii of O^(2-),F^(-) , Na^(+) and Mg^(2+) are in the order :

Manya, Kartik, Gurnoor and Sheena had arranged the ions F^(-), Na^(+), O^(2-) and Mg^(2+) in decreasind orders of their ionic radii. "Manya" " " -O^(2-)gtMg^(2+)gtF^(-)gtNa^(+) "Kartik" " " - Mg^(2+) gt Na^(+)gtO^(2-)gt^(-) "Gurnoor" " " -O^(2-)gtF^(-)Na^(+)gtMg^(2+) "Sheema" " " - F^(-) gt Na^(+)gtO^(2-)gtMg^(2+) Who had provided the correct order of their decreasing ionic radii ?

The ions O^(2-), F^(-), Na^(+), Mg^(2+) , and A1^(3+) are isolectronic. Their ionic radii show

a. Among Cu^(o+) , Cu^(2+) and Cu which is the largest in size and why? b. Which element in periodic table has the highest IE (ionisation energy)? c. Which element, Mg or Al , is more metallic and why?

Consider the ions Li^(+),Na^(+),Be^(2+) and Mg^(2+) . Which two are closest to one another in size?