Question

What is the valency of bromine ?

Answer 1

Valency of bromine is 1. Valency is the combining power of an element. It is determined by the number of valence electrons in the outermost shell of the element. 

Bromine has atomic number 35, which means it has 7 electrons in its valence shell. It needs one more electron to attain the noble gas configuration.

Hence its valency is 1