Across
- 3. the time that it takes for half the atoms in a given sample to decay
- 7. 6.02 x 10^23
- 8. the basic unit of matter
- 9. a large nucleus splits into two smaller nuclei
- 12. element with only one proton in the nucleus
- 15. water is a ________ molecule
- 18. small number used to state the ratio of elements in a chemical formula
- 19. a nuclear emission containing two protons and two neutrons
- 20. a nuclear emission with no mass and a negative charge
- 21. the highest energy electron shell
- 23. a negative subatomic particle discovered by Thomson
- 24. horizontal arrangement of elements in the periodic table
- 26. Mrs. Torres' favorite compound
- 27. Ar
- 28. from gas to liquid
Down
- 1. two or more elements chemically combined
- 2. symbol for iron
- 4. combines two light nuclei to form a heavier nucleus
- 5. element number 79
- 6. neutral particle inside the nucleus of an atom
- 10. contains protons and neutrons
- 11. vertical columns on the periodic table
- 13. substance shown before the arrow in a chemical equation
- 14. nuclear emission with the greatest penetration power
- 16. letters that represent an element in the Periodic Table
- 17. from liquid to solid
- 22. it goes up as the temperature goes up
- 24. positive particle inside the nucleus of an atom
- 25. substance shown after the arrow in a chemical equation
- 29. symbol for silver