Across
- 4. negatively charged subatomic particles in the outermost energy level
- 7. distance between two adjacent wave crests
- 8. energy is neither created nor destroyed;law of conservation of energy
- 10. a subatomic particle with no charge
- 15. heat energy transferred by waves
- 17. entropy of an isolated system never decreases
- 21. mathematically defined region of negative charge surrounding the nucleus
- 22. an arrangement of elements in which elements are separated into groups based on their properties
- 23. the number of protons in the nucleus of an atom
- 25. these objects allow no or very little thermal energy through
- 26. heat energy transferred by currents
Down
- 1. the tiny, dense central portion of an atom, composed of protons and neutrons
- 2. energy stored in a system
- 3. two systems that have reached thermal equilibrium with each other
- 5. the smallest particle of an element that retains its identity in a chemical reaction
- 6. number of wave cycles that pass a given point per unit of time
- 9. a positively charged subatomic particle found in the nucleus of an atom
- 11. heat energy transferred by direct contact of objects
- 12. the simplest form of matter that has a unique set of properties and cannot be broken down
- 13. total number of protons and neutrons in the nucleus
- 14. one or two letter representation of an element
- 16. total kinetic energy of the atoms of a substance
- 18. state where heat is no longer flowing
- 19. atoms of the same element that hold different numbers of neutrons
- 20. a negatively charged subatomic particle
- 24. energy of an object's motion