Chemistry

2. the point on a phase diagram in which two phases of a substance become indistinguishable from each other, a supercritical fluid.
7. attractions between oppositely charged regions of polar molecules.
9. the mass of an atom given in amu
13. positive ion
14. transfer of electrons between atoms, resulting in cations and anions.
15. a measure of how strongly atoms attract bonding e- to themselves.
16. negative ion
18. properties of elements will reoccur in a periodic fashion if they are arranged in order of increasing atomic #.
19. sharing of electrons by atoms so that all atoms involved achieve a filled valence level.
20. transition of a substance directly from solid to gas

1. atoms will gain, lose, or share valence e- to attain a 8 valence electrons. (except for H – Boron)
3. the energy required to remove an e- from an atom
4. a description of an element’s tendency to undergo chemical reactions.
5. transition of a substance directly from gas to solid
6. the temperature and pressure at which the solid, liquid, and gas forms of a substance coexist.
8. the reduction of the attractive force b/t a nucleus and its outer e- due to the blocking effect of the inner e-
10. substances that are volatile vaporize easily
11. Atoms that have 8 valence electrons have ____ potential energy because they have already reached the most stable state.
12. measured as half the distance between the nuclei of atoms of an element
17. an atom or group of atoms that has either gained or lost e- so that it is no longer electrically neutral