Periodic Table
Across
- 4. the name for rows on the periodic table
- 6. the group that includes elements 57-71
- 12. the heaviest noble gas
- 14. a negatively charged subatomic particle
- 15. a positively charged subatomic particle
- 16. electrons in the outermost energy level
- 17. a group on the periodic table that looks like a stair step
- 19. the group located in group 17
- 20. the group of elements located to the left of the metalloids
Down
- 1. a group of elements with the same number of valence electrons
- 2. a neutrally charged subatomic particle
- 3. number that denotes the number of protons in an atom
- 5. the heaviest alkaline earth metal
- 7. elements in blocks 3-12
- 8. the group that includes oxygen and nitrogen
- 9. the name for columns on the period table
- 10. the element with 15 protons
- 11. denotes elements that use the same orbitals to hold their valence electrons
- 13. the name for group 1 elements
- 18. the element with a mass of 197