[{"Bold_text": "noun", "List Items": ["Also calledneg·a·tron[neg, -, uh, -tron].Physics, Chemistry.an elementary particle that is a fundamental constituent of matter, having a negative charge of 1.602 × 10?19coulombs, a mass of 9.108 × 10?31kilograms, and spin of ½, and existing independently or as the component outside the nucleus of an atom.", "Electricity.a unit of charge equal to the charge on electron."]}]