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 experts Please answer this!! →when to apply fajans rule while checking thermal stability and when to apply Lattice energy factor.   also find thermal stability of  1) BeCl2 ,MgCl2, CaCl2 2)LiF, NaF, KF  
Asked by jhajuhi19 | 28 Mar, 2019, 01:02: AM
answered-by-expert Expert Answer
bold italic A bold italic c bold italic c bold italic o bold italic r bold italic d bold italic i bold italic n bold italic g bold space bold italic t bold italic o bold space bold italic F bold italic a bold italic j bold italic a bold italic n bold apostrophe bold italic s bold space bold italic R bold italic u bold italic l bold italic e bold space bold minus C o v a l e n t space c h a r a c t e r space alpha space P o l a r i z a t i o n space o f space a n i o n s space alpha space i o n i c space p o t e n t i a l space equals space fraction numerator C h a r g e space o f space c a t i o n over denominator R a d i u s space o f space c a t i o n end fraction A n d space s o comma space M e l t i n g space p o i n t space o f space C o m p o u n d space space alpha space I o n i c space C h a r a c t e r space alpha space fraction numerator 1 over denominator C o v a l e n t space c h a r a c t e r end fraction bold italic F bold italic a bold italic c bold italic t bold italic o bold italic r bold italic s bold space bold italic a bold italic f bold italic f bold italic e bold italic c bold italic t bold italic i bold italic n bold italic g bold space bold italic L bold italic a bold italic t bold italic t bold italic i bold italic c bold italic e bold space bold italic e bold italic n bold italic e bold italic r bold italic g bold italic y bold minus left parenthesis a right parenthesis space S i z e space o f space i o n s space long dash space A s space t h e space s i z e space o f space i o n s space d e c r e a s e s space t h e i r space i s space c o m p a c t space p a c k i n g space o f space a t o m s space s o space s y s t e m space i s space s t a b l e space w i t h space h i g h space l a t t i c e space e n e r g y space f o r space e x a m p l e space L i F space c o n t a i n s space h i g h space l a t t i c e space e n e r g y. left parenthesis b right parenthesis C h a r g e space o n space i o n s long dash A s space t h e space c h a r g e space o n space i o n s space i n c r e a s e s comma space t h e space i r i s space h i g h space a t t r a c t i o n space b e t w e e n space i o n s space s o space s t a b i l i t y space i n c r e a s e s space w h i c h space i n c r e a s e s space l a t t i c e space e n e r g y space f o r space e x a m p l e space A l 2 O 3 greater than M g c l 2 greater than N a C l. left parenthesis c right parenthesis B o n d space c h a r a c t e r minus space i o n i c space c o m p o u n d s space h a v e space h i g h space l a t t i c e space e n e r g y space t h a n space c o v a l e n t space c o m p o u n d space d u e space t o space m o r e space s t a b i l i t y. F a c t o r s space a f f e c t i n g space L a t t i c e space e n e r g y space minus space I f space t h e space s i z e space o f space c a t i o n space i s space s m a l l comma space m o r e space e f f i c i e n t space o f space p a c k i n g space i n space c r y s t a l space l a t t i c e space t a k e s space p l a c e space w h i c h space r e s u l t s space i n space h i g h e r space t h e r m a l space s t a b i l i t y space a n d space t h u s space h i g h e r space L a t t i c e space E n e r g y space S o comma space t h e r m a l space s t a b i l i t y space o r d e r space i s bold space bold italic B bold italic e bold italic C bold italic l subscript bold 2 bold space end subscript bold greater than bold italic M bold italic g bold italic C bold italic l subscript bold 2 bold space bold greater than bold space bold italic C bold italic a bold italic C bold italic l subscript bold 2 A n d bold space bold italic L bold italic i bold italic F bold greater than bold italic N bold italic a bold italic F bold greater than bold italic K bold italic F
Answered by Sumit Chakrapani | 28 Mar, 2019, 03:08: AM

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