Across
- 4. subatomic particle with a charge of negative electricity
- 7. the central and most important part of an atom
- 14. there is a fundamental limit to how well you can simultaneously know the position and momentum of a particle
- 15. a beam of electrons emitted from the cathode of a high-vacuum tube
- 16. the basic unit of a chemical element
- 17. equation used to describe the wave properties of matter
Down
- 1. regions of space around the nucleus of an atom where an electron is likely to be found
- 2. the lowest energy state of an atom or other particle
- 3. Bohr's electron energy level
- 5. every compound is formed of elements combined in specific ratios by mass that are unique for that compound
- 6. energy emissions come only in certain amounts or quantities
- 8. a subatomic particle of about the same mass as a proton but without an electric charge
- 9. subatomic particle occurring in all atomic nuclei, with a positive electric charge
- 10. an emission spectrum that consists of a continuum of wavelengths
- 11. the number of protons in the nucleus of an atom
- 12. spectrum an emission spectrum consisting of separate isolated lines
- 13. a helium nucleus emitted by some radioactive substances, originally regarded as a ray
- 18. a particle representing a quantum of light or other electromagnetic radiation