Br and Chemical element

Br noun - A nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water.

Chemical element and Br are semantically related. In some cases you can use "Chemical element" instead a noun "Br".

Chemical element noun - Any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter.

Br and chemical element are semantically related. Sometimes you can replace term "Br" with "Chemical element", this terms are similar.