Why cations are Lewis acids?

What are Lewis acids and bases?

What is a Lewis acid? Illustrate with an example.

Which acts as Lewis acid in the reaction, SnCI_2+2CI^-rarrSnCI_4+2e^-

Can aniline react with a Lewis acid?

Classify the following species into Lewis acis and Lewis bases and show how these act as Lewis acid//base : OH^-

Classify the following species into Lewis acis and Lewis bases and show how these act as Lewis acid//base : F^-

Classify the following species into Lewis acis and Lewis bases and show how these act as Lewis acid//base : H^+

Classify the following species into Lewis acis and Lewis bases and show how these act as Lewis acid//base : BCl_3

In the complex [Co(NH_3)_6]^(3+) , the species acting as Lewis acid and Lewis bases are respectively___________.

Explain why cation are smaller and anions larger in radii than their parent atoms?