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Byerly Chapter 12
Chapter 12 vocabulary
| Question | Answer |
|---|---|
| periodic table | a table that lists all the existing elements |
| periodic | having a regular repeating pattern |
| periodic law | properties of elements are periodic by their atomic numbers |
| Dmitri Mendeleev | created the first periodic table |
| Henry Moseley | created the second periodic table |
| metals | elements that are shiny, good conductors,malleable and ductile |
| non-metals | elements that are dull and are poor conductors |
| metalloids | elements that have properties of both metals and non-metals |
| periods | horizontal rows in the periodic table |
| groups | column of elements in the periodic table |
| ductile | the ability of a substance to be drawn into a wire |
| malleable | the ability of a substance to be pounded into thin sheets |
| luster | an object's ability to reflect light |
| valence | the electrons in an atom's outer most energy level |
| ion | a charged particle that occurs when electrons move from one atom to another |
| families of elements | a column in the periodic table, aka, a group |
| alkali metals | elements in group 1 |
| alkaline metals | elements in group 2 |
| transition metals | elements in group 3 |
| halogens | elements in group 17 |
| noble gases | elements in group 18 |
| rare earth elements | metal elements found in group 3 of the periodic tableand the 6th and 7th periods, made of two series: Lanthanide and Actinide |
| lanthanides | any of 15 elements from 57-71 that have common properties |
| actinides | elements 90-103 and have common properties |
| reactivity | the tendency of a substance to undergo chemical reaction, either by itself or with other materials, and to release energy |