chemistry crossword

2. A combination of more than one element
6. A species with an overall negative charge
8. The specific set of principal, angular momentum, and magnetic quantum numbers for an electron.
10. A compound that increases the amount of H+ ions in an aqueous solution
12. Atoms of the same element that have different numbers of neutrons
14. The centre of an atom that contains protons and neutrons
15. A physical combination of more than one substance
17. the hardest part of chemistry
18. A gas law that relates pressure and volume at constant temperature and amount
20. neutral subatomic particle
21. negatively charged subatomic particle

1. An element that exists in various colors and phases, is brittle, and does not conduct electricity or heat well
3. Law of physics that states that the total energy of an isolated system does not increase or decrease.
4. A species with an overall positive charge
5. The number of things equal to the number of atoms in exactly 12 g of carbon-12; equals 6.022×1023 things
7. A compound that increases the amount of OH− ions in an aqueous solution
9. are located to the far right of the periodic table and make up the eighteenth column
11. the science that deals with the properties, composition, and structure of substances
13. the chemical elements in group one of the periodic system
16. A gas law that relates volume and temperature at constant pressure and amount
19. a positive charged subatomic particle