Across
- 3. a particle smaller than an atom
- 5. any of a class of substances characterized by high electrical and thermal conductivity
- 6. a column of elements in the periodic table of the chemical elements
- 8. a substance having a finite activation energy (band gap) for electron conduction
- 9. a chemical element is the charge number of an atomic nucleus
- 10. The horizontal rows of the periodic table
Down
- 1. the total number of protons and neutrons
- 2. Atoms with the same number of protons but different numbers of neutrons
- 4. electrons are arranged in concentric circular orbits around the nucleus
- 7. the mass of an atom of a chemical element expressed in atomic mass units