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PBHS Chem 1 Ch 6.1
chapter 6.1 organizing elements on the periodic table
| Question | Answer |
|---|---|
| 1829 German chemist named ________ organized elements into a table | J.W. Dobereiner |
| group of three elements with similar properties | triad |
| example triad | chlorine, bromine, iodine |
| 1869 Russian chemist _____________ published a table of elements | Dmitri Mendeleev |
| published later in the same year that Mendeleev published his table; this German chemist receives little notice for his work | Lothar Meyer |
| Mendeleev arranged the elements in his table in order of __________ | increasing atomic mass |
| Mendeleev left gaps in his table, predicting that ________ & ________ would be discovered to fill them | gallium & germanium |
| 1913, this British chemist ___________ recognized that Mendeleev had a few elements out of order and reordered the elements based on their _____________ | Henry Moseley, increasing atomic number |
| on the Periodic Table, rows are called | periods |
| on the Periodic Table, columns are called | groups |
| each period corresponds to a _________ | principal energy level |
| period 1 corresponds to the _____ energy level | first or 1s |
| period 2 corresponds to the ______ energy level | second or 2s & 2p |
| the elements within a column or group have simlar properties. This pattern of properties repeats as you move from one period to the next. This is called the _______________. | periodic law |
| 80% of the elements on the periodic table are classified as ____ | metals |
| metals are good __________ of heat and electricity | conductors |
| all of the metals are _______ except for ________ which is a ______________ | solids, mercury, liquid |
| to the upper right of the periodic table are found the _____________ | non-metals |
| many of the non-metals are _________, with the exception of ________ which is a liquid | gases, bromine |
| elements found on either side of the stair-step line are called ___________ | metalloids |
| metalloids have properties of both __________ and ____________ | metals & non-metals |
| a common metalloid element is _________ and is the primary component of ___________; this element is used in making computer chips and glass | silicon, sand |
| identify this element as a metal, non-metal or metalloid: gold | metal |
| identify this element as a metal, non-metal or metalloid: sulfur | non-metal |
| identify this element as a metal, non-metal or metalloid: barium | metal |
| name two elements that have similar properties to sodium | lithium, potassium, rubidium, cesium, francium |
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