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why trihalides in group 15 except BiF3 are covalent in nature.

why trihalides in group 15 except BiF3 are covalent in nature.

Grade:9

2 Answers

SAI SARDAR
1700 Points
5 years ago
 trihalides in group 15 except BiF3 are covalent in nature.because Bi has large atomic size.in Faugens rule large anionic size and small cationic size is favourable for ionic bond.
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Satyam Shukla
15 Points
2 years ago
BiF3 is not covalent , ionic because,  according to Fajan's rule, smaller the Cationic size (+ve charge) and greater the anionic size,  the tendency to form covalent bond will increase and vice versa. 

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