chemistry crossword

2. the science that deals with the properties, composition, and structure of substances
6. Atoms of the same element that have different numbers of neutrons
10. A species with an overall positive charge
12. Law of physics that states that the total energy of an isolated system does not increase or decrease.
14. negatively charged subatomic particle
16. are located to the far right of the periodic table and make up the eighteenth column
18. a positive charged subatomic particle
19. the chemical elements in group one of the periodic system
20. A gas law that relates pressure and volume at constant temperature and amount

1. A compound that increases the amount of OH− ions in an aqueous solution
3. A physical combination of more than one substance
4. The specific set of principal, angular momentum, and magnetic quantum numbers for an electron.
5. neutral subatomic particle
7. The centre of an atom that contains protons and neutrons
8. A species with an overall negative charge
9. The number of things equal to the number of atoms in exactly 12 g of carbon-12; equals 6.022×1023 things
10. A gas law that relates volume and temperature at constant pressure and amount
11. A combination of more than one element
13. A compound that increases the amount of H+ ions in an aqueous solution
15. An element that exists in various colors and phases, is brittle, and does not conduct electricity or heat well
17. the hardest part of chemistry