1. Every known element has (a) the same type of atoms (b) the same number of atoms (c) a unique type of atom (d) several different types of atoms. 2. An atom consists of (a) one nu... 1. Every known element has (a) the same type of atoms (b) the same number of atoms (c) a unique type of atom (d) several different types of atoms. 2. An atom consists of (a) one nucleus and only one electron (b) one nucleus and one or more electrons (c) protons, electrons, and neutrons (d) answers (b) and (c). 3. The nucleus of an atom is made up of (a) protons and neutrons (b) electrons (c) electrons and protons (d) electrons and neutrons. 4. Valence electrons are (a) in the closest orbit to the nucleus (b) in the most distant orbit from the nucleus (c) in various orbits around the nucleus (d) not associated with a particular atom. 5. A positive ion is formed when (a) a valence electron breaks away from the atom (b) there are more holes than electrons in the outer orbit (c) two atoms bond together (d) an atom gains an extra valence electron. 6. The most widely used semiconductive material in electronic devices is (a) germanium (b) carbon (c) copper (d) silicon. 7. The difference between an insulator and a semiconductor is (a) a wider energy gap between the valence band and the conduction band (b) the number of free electrons (c) the atomic structure (d) answers (a), (b), and (c). 8. The energy band in which free electrons exist is the (a) first band (b) second band (c) conduction band (d) valence band. Read more