Chemistry

2. Which metal can protect you from gamma radietion?
5. What Chemistry can be?
8. Which factor affects rate of a reaction?
9. Molecules and atoms can form...
11. A heavy toxic gas used in the II World War
12. Used to accelerate a reaction
13. Written to find out which and how many molecules/atoms a reaction contains
15. Which type of bond do following substances have: iodine, water, chlorine, oxygen.

1. Number of lone electrons on the outer electron shell
3. If some atoms have the same nuclear charge but their mass differs, they are...
4. Which gas did Hindenburg rigid airship crashed in 1937 contained?
6. Сrimson in alkalis
7. Its ion produces red fire
10. What structure can be in compounds?
14. How many lone electrons does carbon have on its outer electron shell
16. A paper used to check acidity of substances