| A | B |
|---|
| atomic mass | sum of the protons and neutron in the nucleus of an atom |
| family | column of elements on the periodic TAble; group |
| period | horizontal row of elements on the Periodic Table |
| properties in a family | similar properties; all elements in a family have the same number of valence electrons |
| properties in a period | elements i a period do not have the same properties |
| soluble | substance capable of dissolving |
| insoluble | substance not able to dissolve |
| solvent | a substance that dissolves another substance in a solution |
| solubility | amount of a substance that can be dissolved in a liquid |
| saturated solution | when a solute dissolves in a solvent until NO more will dissolve |
| solute | the substance that dissolves and seems to disappear in a solution |
| atom | smallest particle of an element that has all the properties of that element |
| atomic number | number of protons in the nucleus of an atom |
| atomic mass unit (amu) | unit used to measure the mass of the subatomic particles; a proton has the mass of one of these |
| nucleus | small, dense, positively charged center of an atom |
| neutron | subatomic particle with no electric charge that is found in the nucleus of an atom |
| proton | subatomic particle that has a positive charge and is found in the nucleus of an atom |
| electron | negatively charged subatomic particle found in the electron cloud of an atom |
| chemical symbol | 1,2, or 3 letter symbol used to represent an element |
| valence electrons | found in the outer energy level of an atom |
| 3 main categories found on the Periodic Table | metals, metalloids, and nonmetals |
| location of metals on Periodic Table | found on the left side of the Periodic Table |
| location of nonmetals on the Periodic Table | found on the right side of the Periodic Table |
| location of metalloid on the Periodic Table | stair-step pattern on the Periodic Table |
| elements on the left side of the Periodic Table lend electrons | elements on the right side of the Periodic Table gain electrons |
