| A | B |
|---|
| physical change | change that doesn't alter composition |
| matter | anything that has mass and takes up space |
| chemical properties | properties which can be observed when matter interacts |
| element | pure substance which consists of only one element from the periodic table |
| compound | two or more elements chemically bonded together |
| alkali metals | first column of periodic table, Li, Na, K, Rb, Cs, Fr |
| alkaline earth metals | Be,Mg,Ca,Sr,Ba,Ra (group 2) |
| halogens | F,Cl,Br,I,At (group 17) |
| noble gases | inert,He,Ne,Ar,Kr,Xe,Rn |
| extensive property | property which depends on quantity of matter |
| atomic number | smaller number on table, equivalent to number of protons |
| pure substance | a single element or compound not combined with anything else |
| extensive property | property in which the quantity of matter present affects the property |
| Regions of the periodic table | metals,non-metals,metalloids,noble gases |
| period | row on the periodic table |
| group | column on the periodic table |
| JJ Thompson | discovered the electron |
| Ernest Rutherford | discovered the nucleus |
| nucleus | dense center region of atom containing protons and neutrons |
| isotope | elements w/same #protons, but differing in #neutrons |
| mass number | # neutrons + # protons |
| atomic mass | mass of one atom in amu |
| molar mass | mass of one mole of atoms in grams |
| electronegativity | ability of an atom to draw electrons to itself |
| atomic radius | 1/2 the distance between nuclei of adjacent atoms |
| cation | positively charged particle |
| anion | negatively charged particle |
| avogadro's number | 6.023 x 10^23 |
| ionic compound | compound formed when one atoms transfers electrons to another atom |
| covalent compound | compound formed when one atom shares electrons with a second atom |
| octet rule | states that 8 outter electrons needed for stability |
| density | mass/volume |
| intensive properties | color,density,flammability, amt. doesn't matter |
