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periodic table
| Term | Definition |
|---|---|
| alkali metals | highly reactive metals, never found uncombined. Metals are soft enough to cut with a butter knife |
| alkaline earth metals | not as reactive but still never found uncombined. they serve as important minerals for our body. |
| transition metals | less reactive metals. useful for building materials, jewellery and coins. also used as oxides to make paint and pigments. |
| noble gases | unreactive gases always found on their own nature. used in neon signs, balloons, and light bulbs |
| metalloids | elements on both the zig zag line.both metals and non metals. |
| periods | rows one through seven. atomic number increases from left to right. those in the same period have the same number of energy levels |
| groups | most reactive and most inert. are families which are the coluoms from one to eighteen. same number of valence electrons. chemical properties are very similar. |
| metals | shiny luster, solid at room temperature except mercury and germanium.ductile, malleble, good conductors, high density, high melting points, reactivity |
| non metals | no luster, poor conductors, brittle, not ductile, not maleable, low density, low melting point, less reactive than metals. |
| periodic table | arranges all of the known elements in order increasing atomic number.order generally coincides with increasing atomic mass too. |
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