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periodic Table
| Term | Definition |
|---|---|
| Metals | Solid at room temperature Shiny luster ductile |
| nonmetals | red properties on the periodic table no luster poor conductors of heat and electricity brittle not ductile |
| metaloids | green part on the periodic tables elements o both sides of the zigzag line (staircase) have properties or both metals and nonmetals |
| periods | the periods on the PT are the rows numbered from 1-7. atomic number increases from left to right those in the same period have the same number of energy levels or shells chemical properties are not all simalar |
| Groups | The groups or families on the PT are the columns numbered from 1-18 |
| Alkali Metals | Highly reactive metals They are so reactive that they are never found uncombined in nature Mtals soft enough to be cut with a butter knife Li, Na, K |
| Transition metals | less reactive metals Hard, dense metals that are useful as building materials, jewelry and coins also used as oxides to make paints and pigments Fe,Cu,Au,Ag |
| Noble Gases | nonreactive gases do not react naturally-always found on their own in nature used in "neon" signs, balloons and light bulbs He,Ne,Ar |