sentences: a electron has a negative -1 electric charge & an electron is a kind of charged particle ->  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 ->  electron is the smallest, negtively-charged particle in an atom  electron is the smallest, negtively-charged particle in an atom & electrons orbit the nucleus of an atom -> the smallest, negatively-charged particles in the atom orbit the nucleus of the atom