What is the connection between electrons and protons

Electrons and protons are connected with one another in term of charge and size.

Explanation:

The size of electron and proton is always same in any atom but they possess opposite charge. Electron in any atom carries negative charge where as proton carries the positive charge. In any neutral atom the charge between electron and proton is balanced along with the size. The nucleus of any atom bounds only proton and neutron but the electron is present revolving around the nucleus.