Lattice energy

well i have found dat Li has lesser ionic radii than that of calcium in wikipedia.sry for confusions.

No this one is rite
MgO > CaF2 > LiF

ya,that might be a reason as the size differing by one shell.i actually didn't link these two.just applied the born-lande's concept.k.lets see.

he said to consider charge density... then Li+ would have greater charge density than Ca2+

i don't know abt dat.but any problem wid ma explanation ?

abhi: our sir said , MgO > LiF > CaF2

From the Born-Landé equation it can be seen that the lattice energy of a compound is dependent on a number of factors :

i) as the charges on the ions increase the lattice energy increases (becomes more negative),
ii) when ions are closer together the lattice energy increases (becomes more negative)

obviously , LiF has less lattice energy than oder two wid respect to 1st point.

now, Ca⁺² is having a larger ionic radii than Mg⁺² , thus wid respect to 2nd point , MgO > CaF₂.

thus, the order is what asish hs given.

LiF will have max.

well i havent seen dat data in jd lee,i have seen this in ncert

http://en.wikipedia.org/wiki/Born-Land%C3%A9_equation

i have read this in jd lee.but for reference u can see the above link.

born lande equation.

why ??

strongest bond is b/w Li⁺ and F^- naa ??