Across
- 4. A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
- 6. Elements combined in a compound are always in the same proportions
- 7. The basic unit of an element
- 8. An emission spectrum that consists of a continuum of wavelengths.
- 9. The positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.
- 12. If waves can behave like particles then particles can behave like waves.
- 15. A positively charged particle consisting of two protons and two neutrons, emitted in radioactive decay or nuclear fission; the nucleus of a helium atom.
- 16. Energy emissions only come in certain ammount or quantities.
- 17. A beam of electrons emitted from the cathode of a high-vacuum tube.
Down
- 1. The energy level denoted by the principal quantum number n. The first element in a period of the Periodic Table introduces a new principal energy level.
- 2. 3 Dimensional regions around the nucleus that contain the electrons. Often described as looking like "fuzzy clouds".
- 3. That light consisted of massless particles called __________.
- 5. A subatomic particle of about the same mass as a proton but without an electric charge.
- 10. The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
- 11. An emission spectrum consisting of separate isolated lines. composed of a number of distinct frequencies. each element as their distinct line spectrum
- 13. A stable subatomic particle with a charge of negative electricity
- 14. The lowest energy state of an atom.