Across
- 2. one magnesium atom and two chlorine atoms
- 4. the atomic number is 28
- 5. numbers going across the top of the periodic table
- 6. the symbol for chromium
- 7. substance made entirely of one type of atom
- 9. element that has the symbol C
- 11. group 7, period 2
- 13. within the air
- 14. atomic mass for oxygen
Down
- 1. numbers on the left side of the periodic table
- 3. 2 or more atoms held together by chemical bonds
- 6. 2 or more different element held together by chemical bonds
- 8. 2 or more substances not chemically combined together
- 10. a compound that is used daily
- 12. amount of alkali metals on the periodic table
- 13. what is hydrogens atomic number