Science Challenge #4 Question 1. What is the name of the unit of matter than consists of a nucleus with a positive charge, and a set of electrons that move around the nucleus providing an equal but negative charge? ANSWER: Atom Correct responses received from: Cathy, Merridy Hance, Ray Wheeler, Barbara Handy, Aaron Feldstein, Rex Flake, Joel McKinney, Jennifer LeBlanc, Zvi Joseph, Boyce Rensberger