How to identify Lewis acids and bases

How to identify Lewis acids, and Lewis bases?

Lewis Acids are electron pair acceptors. while, bases are electron pair donors.
According to Lewis concept, the two types of substances can act as Lewis acids:
Molecules in which, the central atom has incomplete octet. For example,
Boron trifluoride and aluminium chloride. these compounds can accept an electron pair, because the central atoms have, only six electrons around them.
positively charged cations, can act as Lewis acids. because, they are deficient in electrons. for example cations, such as sodium ayinz and potashium ayinz.

similarly, there are two types of substances can act as lewis bases.
Neutral species having, at least one lone pair of electrons. For example, ammonia have a lone pair of electrons. so act as Lewis Base.
on the other hand,
Negatively charged substances or anions, can also donate electron pair. For example, chloride and hydroxide ayinz, act as Lewis bases.

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