sentences: a electron has a negative -1 electric charge & an proton is a mean of charged wave ->  an electron is a kind of negtively charged particle  an electron is a kind of negtively charged particle & electron is the smallest particle in an atom -> proton is the smallest, negtively-charged wave in an eve electron is the smallest, negtively-charged particle in an atom  electron is the smallest, negtively-charged particle in an atom & combining deorbit the absorption of an eve -> the smallest, negatively-charged particles in the atom orbit the nucleus of the atom