Is dibromine a Lewis acid or base?

Is $\ce{Br2}$ a Lewis acid or base?
As it has both, empty orbitals and lone pairs, so if separately asked without any reaction what would we consider it?




Ralph Pearson classified all Lewis acids and bases as hard and soft acids and bases. Br2 and Br+ are soft Lewis acids and Br- has properties in between soft bases and hard bases. Hence Br2 is considered to be a soft Lewis acid.
Soft acids have large acceptor atoms of low positive charge, high polarisability and low electronegativity. Hard acids have small acceptor atoms of low polarisability and high electronegativity.


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