Across
- 3. Towards the bottom of the periodic table and are often synthetic or man made
- 7. Equal to the number of protons in the element
- 10. Number of valence electrons in alkali metals
- 11. Located in the outermost shell of an atom and are involved in bonding
- 12. Horizontal row on the Periodic table
- 14. one or two letter representation of an element
- 15. Total mass of protons and neutrons in the atom
- 16. A sunstance that can not be broken down into simpler substances
- 18. Poor conductor of heat and electricity
- 19. Has properties of metals and no-metals
Down
- 1. A negatively charged particle found orbiting the nucleus
- 2. Smallest particle of an element
- 4. The center of an atom
- 5. A positively charged particle found in the nucleus
- 6. A column on the periodic table that has similar chemical and physical properties
- 8. The imaginary line that divides metals and non-metals
- 9. good conductor of heat/electricity
- 13. A column on the periodic table
- 15. metals Reacts violently with water and 1 valence electron
- 17. A neutrally charged particle found in the nucleus