Why is the addition of Br2 to an alkene not a nucleophilic addition reaction ?

Question

My text book says that when a Br2 molecule approaches the C=C in an alkene, a δ+ charge is induced on a nearer Br atom. Then this atom attracts the electrons in the C=C bond and forms a covalent bond.

The Br-Br bond breaks heterolytically and the Br- ion forms a bond with the positively charged carbon. 

 

So why can't it be called a nucleophilic addition reaction instead of a electrophilic addition reaction ??

Answer 1

Reactions are classified by the action of the reagent (bromine here) on the substrate (alkene here). Bromine acts as an electrophile, thus it is classified as an electrophilic addition to an alkene.