Answer: Most ionic bonds: PF3
Least ionic bonds PBr3
Most ionic bonds BF3
Least ionic bonds NF3
Most ionic bonds TeF4
Least ionic bonds BrF3
Step-by-step explanation:
In order to classify the type of bond, we calculate the molecule electronegativity by subtracting the individual electronegativity of each atom.
Keep in mind that a result of 1.7 or more, will let you know that it is an ionic bond ( as you can see in the image)
Let´s check each atom electronegativity: P = 2.1 ; Cl= 3.0; Br= 2.8 ; F =4.0 ; B= 2.0; N=3.0 ; C=2.5; Se=2.4 ; Te= 2.1 ; Br =2.8
Now we start with the first set members : PCl3 = 3.0- 2.1 = 0.9
PBr3 = 2.8- 2.1 = 0.7
PF3= 4.0 - 2.1 = 1.9
as we can see, PF3 has the higher value of electronegativity, more than 1.7 of electronegativity as we have previously mentioned, means it has more character ionic bond than others.
By substracting electronegativities of each atom, you will realize that is pretty easy to rank any member as more or less electronegative.