Across
- 2. / anything that has mass and takes space
- 4. / dense center containing protons and neutrons
- 5. / negatively charged particle orbiting nucleus
- 8. / neutral particle found in nucleus
- 11. Number / sum of protons and neutrons in an atom
- 13. / group of atoms chemically bonded together
- 16. / process of atoms joining into a larger atom
- 18. / substance formed in a chemical reaction
- 21. / easily changes or reacts
- 22. / smallest unit that makes up matter
- 25. Mass / weighted average mass of an element’s atoms
- 26. / force that holds atoms together
- 28. / smallest amount of energy possible
- 29. / positively charged particle in nucleus
- 30. / atom of same element with different neutrons
Down
- 1. / tiny piece that makes up matter
- 3. / substance made of one type of atom
- 6. / energy released as waves or particles
- 7. / level where electrons orbit the nucleus
- 9. / regions that show where electrons may be
- 10. / splitting of an atom into smaller parts
- 12. / arranged in repeating chemical patterns
- 14. Cloud / space around nucleus where electrons move
- 15. / not likely to change or react
- 17. / atom that has gained or lost electrons
- 19. / substance made from different elements bonded
- 20. / starting substance in a chemical reaction
- 23. / ability to cause change or do work
- 24. / electrons in the outermost shell
- 27. Number / number of protons that identifies an element