Across
- 2. the spontaneous process in which an atomic nucleus emits radiation
- 4. this element radioactively decays into Lead
- 5. number of electron energy levels and also the number of rows in the periodic table
- 7. chemicals listed to the left of the arrow in a chemical reaction
- 11. center of an atom
- 12. atoms with the same number of protons but different number of neutrons
- 13. adding this to a reaction can speed it up
- 16. these gases do not react because they are completely stable on their own
- 17. number of electrons the 2nd energy level can hold
- 20. the bonding where electrons are transferred
- 21. it takes the most energy to get this color
- 26. ability of an atom to attract electrons to itself
- 27. neutrons have this charge
- 29. color with the lowest energy
- 30. number of protons
- 32. when a chemical reaction takes in heat
- 33. anything that takes up space and has mass
- 34. a charged particle
Down
- 1. chemicals listed to the right of the arrow in a chemical reaction
- 3. adding protons and neutrons
- 6. when a chemical reaction releases energy
- 8. when an electron gains energy, it moves from a grounded state to this state
- 9. the middle part of the periodic table, which we colored red, are these metals
- 10. Column 1 of the periodic table are these types of metals
- 14. the reason atoms combine with each other
- 15. the bonding where electrons are shared
- 18. protons have this charge
- 19. electrons have this charge
- 22. orbit the nucleus
- 23. father of the Periodic Table of Elements
- 24. the amount of time it takes for one half of a sample to decay
- 25. the conservation of ______ says that matter cannot be created or destroyed
- 28. another name for electron energy levels
- 31. outer electrons can be called this