Answer:
1. (a) protons (b) neutrons (c) electrons
2. positive +, protons. negative -, electrons. no charge 0, neutrons.
3. periodic table
4. 2 atoms
5. chemistry
6. 6 atoms, 4 hydrogen and 2 oxygen
7. oxygen
8. H2O
i dunno the answers for the rest but i hope this helped :)