Final answer:
A Brønsted-Lowry acid or base is also a Lewis acid or base.
Step-by-step explanation:
A Brønsted-Lowry acid or base is also a Lewis acid or base.
The Brønsted-Lowry theory focuses on the transfer of protons in acid-base reactions. A Brønsted-Lowry acid is a molecule or ion that donates a hydrogen ion (proton), while a Brønsted-Lowry base is a molecule or ion that accepts a hydrogen ion. According to the Lewis definition, a Lewis acid is an electron pair acceptor, and a Lewis base is an electron pair donor. Since a Brønsted-Lowry acid or base involves the transfer of a proton, it also meets the criteria of being a Lewis acid or base.