Across
- 5. most reactive nonmetals
- 7. a alkali metal with an atomic mass of 6.94
- 9. these elements have low melting points and are usually gases
- 11. ions are formed from these
- 13. gasses essentially nonreactive
- 16. these gases are colorless
- 17. how many lewis dots does magnesium have
- 18. these elements are good conductors of heat and electricity
- 19. metals the element with the atomic number of 11 belongs to this group
- 20. first person to develop a periodic table by increasing mass
- 22. this group can be oxidize in air
- 24. a transition metal with twenty eight protons
Down
- 1. this group is the most reactive nonmetals
- 2. these have a negative charge
- 3. the modern periodic table is organized by
- 4. the number of charge depends on these
- 6. these metals come from ores in earth´s crust
- 8. a halogens with fifty three electrons
- 10. how many lewis dots does sodium have
- 12. who got credit for designing the periodic table
- 14. these have a positive ion charge
- 15. these elements shape can be easy or hard to change
- 21. noble gas with two neutrons
- 23. a alkaline metal with the symbol of Ra