An ion of bromine with a single negative charge has the symbol and the name

br+, bromide ion
br-, bromide ion
br+, bromium ion
br-, bromium ion

Br is the symbol for the element bromine. It is found in new IUPAC group 17 of a modern periodic table. Bromine is a halogen.

To name a halogen anion with charge -1, replace the suffix "-ine" in the name of the element with the suffix "-ide." For example,

The symbol of a bromine atom is Br. The atom is neutral. However, it carries a negative charge of -1 after it gains one electrons and forms a negative ion. The charge of the bromide ion shall be written as a superscript in its symbol. The size of the charge is written in front of the sign.

The charge on the bromide ion is -1. In the superscript, omit the number 1 and write "-". Hence the symbol

.

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.