E and Z isomers - Priorities with halogens

[shyfox9p]

This is just a simple question.
I know e=trans and Z=cis. However, I was found a site that gave an example of alkene. C1 had a Bromine and a Flourine. C2 had a Chlorine and a hydrogen. For C1, Bromine was given the highest priority.
So my question: Does priority depend on size of the atom/group?

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[jwan14]

It does when it comes to assigning R and S so I bet it's the same for E and Z. The larger the atom the higher the priority

 

[CustomGrills51]

Yep higher atomic #

 

[shyfox9p]

Thanks! I really appreciate it

 

[dentalgirl101]

The higher atomic number wins