How to describe the the yonic value and type of bond of this formula

1. Jan 24, 2009

transgalactic

Br=2.8
P=2.1

i know that we should subtract them
but my formula is:
$PBr_3$

and how to know if its a yonic bond dipolar bond or covalent bond
??

2. Jan 25, 2009

Bacat

Use the template please. It makes it easier to understand your question.