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Fajans' Rules, formulated by Kazimierz Fajans in 1923, are used to predict whether a chemical bond will be covalentor ionic, and depend on the charge on the cation and the relative sizes of the cation and anion.
IonicCovalentLow positive chargeHigh positive chargeLarge cationSmall cationSmall anionLarge anion
Thus sodium chloride (with a low positive charge (+1), a fairly large cation (~1 Å) and relatively small anion (2Å) is ionic; but aluminum iodide (AlI3) (with a high positive charge (+3) and a large anion) is covalent.
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where was the element protactinium found?
Protactinium was discovered in 1913 by Fajans and Gohring in Karlsruhe, Germany.
Amongst LiF and LiI which has more covalent character and why?
LiI. Iodine is less electronegative. Li is very polarising and I- is more readily polarised (fajans rules)
Does silver make ionic or covalent bonds?
Ionic. BUT because of Fajans rules silver salts have significant covalent character which expalins the low solubility of silver chloride.
Do LiCl contain covalent bonds?
No. But Li+ is small and polarising (Fajans rules apply)- so the salt is a little different in its behaviour from the other group 1 chlorides.
Why ionic character is greater for larger cation?
Smaller higher charged cations are more polarising and this gives more covalent character. Larger cations are conversely less polarising. This is "Fajans Rules"
When did Maksymilian Fajans die?
Maksymilian Fajans died in 1890.
When was Maksymilian Fajans born?
Maksymilian Fajans was born in 1827.
When did Kazimierz Fajans die?
Kazimierz Fajans died on 1975-05-18.
When was Kazimierz Fajans born?
Kazimierz Fajans was born on 1887-05-27.
What has the author K Fajans written?
K. Fajans has written: 'A textbook of practical physical chemistry'
What has the author Michael Fajans written?
Michael Fajans has written: 'An alternative to the automobile' -- subject(s): Berkeley University of California, Choice of transportation, Students, Transportation
Can we Use fajans method to determined the exact concentation of a approximate 0.01 M hcl solution?
No. Fajans method relies on the naked eye, which is not as precise as analytical instruments.
where was the element protactinium found?
Protactinium was discovered in 1913 by Fajans and Gohring in Karlsruhe, Germany.
Who discovered protactinium and what date did they discovered it?
Protactinium was discovered in 1913 by Fajans and Gohring in Karlsruhe, Germany.
Amongst LiF and LiI which has more covalent character and why?
LiI. Iodine is less electronegative. Li is very polarising and I- is more readily polarised (fajans rules)
Does silver make ionic or covalent bonds?
Ionic. BUT because of Fajans rules silver salts have significant covalent character which expalins the low solubility of silver chloride.
Do LiCl contain covalent bonds?
No. But Li+ is small and polarising (Fajans rules apply)- so the salt is a little different in its behaviour from the other group 1 chlorides.
