Across
- 1. time period where controlling fire was learned
- 4. mass of one atom in a given element
- 6. periodic table of _________, substance that cannot be broken down any further
- 8. a group of elements in between metals and non-metals
- 10. irreversible change
- 13. theories/predictions made about the atom
- 15. the elements metal + non-metal combined
- 16. a group of elements that are metals and very reative
- 17. reversible change
- 20. a physical characteristic that a substance can have which means to conduct an electric current
- 22. a column in the periodic table with elements with similar traits
- 23. a homogeneous mixture
- 24. neutrons, protons, electrons
Down
- 2. heat entering- cool pack
- 3. system designed to help people against harmful substances
- 5. process of solid turning into gas
- 7. shininess of a substance
- 9. created by an alchemist to create casts
- 11. heat exiting- fire
- 12. a positively charged ion
- 14. the elements non-metal + non-metal combined
- 18. number of __________, are achieved by subtracting the atomic mass by the atomic number
- 19. element that is non-metal and non-reactive
- 21. meaning 5 in terms of naming molecular compounds
- 24. used at the ending when naming a molecular compound