Across
- 5. Tells the number of protons and electrons of the element.
- 10. Okay conductors, brittle solids.
- 12. Weight of an element. Protons + Neutrons = the answer
- 15. Most reactive metals.
- 16. Philosopher who believed all matter is composed of air, fire, earth, and water.
- 18. Pure substance. Made of 2+ elements
- 20. Don't react with anything.
- 21. Philisopher who believed matter was composed of tiny, indivisible particles he called atomos.
- 24. Mixture. You can see the different parts.
Down
- 1. Electrons in the outermost energy level that is not full.
- 2. Pure substance. Made of 1 type of atom
- 3. Energy is realeased/absorbed and a new substance is formed.
- 4. Electrons orbit the nuculues in specific levels.
- 6. Properties that are only seen after a chemical reaction - ability to burn, behaviour in air, flash point, reaction to heat, reaction to water, reaction to acids, and reaction to red and blue litmus.
- 7. Created the Plum Pudding Model. Said that atoms have one large positive chage and negative charges embedded in it.
- 8. Mixture. You can't see the different parts.
- 9. Properties that are observable - ductility, malleability, state, solubility, magnetism, boil/melt point, crystal formation, colour, and conductivity.
- 11. Second most reactive metals.
- 13. Good conductors, shiny, malleable, and ductile.
- 14. Most reactive non-metals.
- 17. All elements are composed of atoms. Created the Billiard Ball Model.
- 19. Bad conductors, dull, brittle.
- 22. Eletrons orbit an extremely dense core.
- 23. Atoms of the same element with different numbers of neutrons.