AsI3 - ionic / covalent?


by Jules18
Tags: asi3, covalent, ionic
Jules18
Jules18 is offline
#1
Oct27-09, 05:08 PM
P: 102
How do you know whether AsI3 is ionic or covalent?

I was asked on an exam to name it, and I called it Arsenic triioide when the prof said it was Arsenic (III) iodide.

I asked a sophomore TA one time how to tell when it's covalent, and she said the beginning column of the p subshell elements (the end of the transition metals) is her dividing line. In other words, if they're both on the left right of that line, it's a covalent compound, and if they're on opposite sides it's ionic.
But apparently this is an exception, so she must have been mistaken.

And according to another exam written by students in the chem club, Sb2Te3 is ionic, so the dividing line isn't the metal-nonmetal dividing line.
It's like you have to know the electronegativity differences or something, which they never give you.
Does anyone have another rule?


~Jules~
Phys.Org News Partner Chemistry news on Phys.org
Space-tested fluid flow concept advances infectious disease diagnoses
New, more versatile version of Geckskin: Gecko-like adhesives now useful for real world surfaces
Researcher develops novel wastewater treatment fabric

Register to reply

Related Discussions
differentiate an ionic from a covalent compounds Chemistry 6
ionic and covalent bonds... Biology, Chemistry & Other Homework 1
Properties Of ionic and covalent Biology, Chemistry & Other Homework 2
ionic or covalent- Please check Biology, Chemistry & Other Homework 1