The charge of a π+-meson is
The charge of an electron is equal and opposite to the charge of a proton.
Question 110 (ii)
Science Application An atom consists of charged particles called electrons and protons. Each proton has a charge of +1 and each electron has a charge -1. Remember the number of electrons is equal to the number of protons, while answering this question : What will be the charge on an atom, if it loses an electron?