chemistry crossword

2. two protons and two neutrons called an alpha particle
4. a physical property that depends on the number of solute particles present not upon thier idenity
6. when the number of protons and nuetrons in the nucleus of an atom change
9. solution is boiled to separate liquids
12. substances that are volatile vaporize easly
13. an atom or group of atoms that has either gained or lost e- so that it is no longer electrically neutral
15. a lot of solute per solvent quanity
17. mixure when indivdual particles cannot be distingushed
20. the ratio of soulte to solvent in a solution
21. the emission of electrons from metal surfaces when photons are absorbed

1. he discovered the proton
3. the mass of an atom given in amu
4. positively charged ion
5. a weak acid or base that changes color
7. the mixture is poured through a filter
8. an arbiturary measuring system that selects one thing to be the standard
10. atoms of the same element with different numbers of nuetrons
11. used when the solute is wanted,but not the solvent
14. a dipole-dipole attraction that occurs between molecules containg hyndrogen bonded to an extremely electrongative atom
16. a neutral particle having equal numbers of p+ and e-
18. he discovered the electron
19. a small amount of solute per solvent quantiy