Chemistry

2. Has an atomic number of 8.
3. A mineral that is found in bananas.
4. The element with the highest melting point.
7. A metal often used as a alloy agent for copper, creating ______ copper.
8. A soft metal; Symbol Ca
12. The fourth most abundant element in the known universe.
13. A gas that is lighter than air, and the first of the noble gases.
14. A brittle yellow substance that is used in compound separation.
17. Often used in pools.
18. A black powder that is used in pyrotechnics due to its green flame when set on fire.
19. Has an atomic weight of 24.305.

1. The country of Nauru bankrupted their entire country on this stuff.
5. 78% of Earth's atmosphere is made up of _______.
6. A hard metalloid that is used in the packets that you can't eat.
9. A large debate has been going on over how to pronounce this element; one of the most widespread metals in use.
10. When combined with a halogen it forms salt.
11. The lightest metal; Sometimes used in batteries.
13. The lightest element.
15. The most reactive halogen.
16. Used in light bulbs to keep the filament from corroding due to oxygen exposure.