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Periodic Table
Metals, nonmetals, metalliods
Term | Definition |
---|---|
Periodic Table | Arranges all the known elements in order of increasing atomic number (# of protons). Also arranged in atomic mass. |
Metals | Solid at room temperature. Shiny luster. Ductile. Can be hammered. Has high density, and high melting point. Good conductor. |
Nonmetals | No luster. Poor conductors of heat. Brittle (breaks easy). Not ductile and not malleable. Has low density and low melting point. Less reactive then metals. |
Metalloids | Elements with a mixture of metals and nonmetals. |
Periods | They are rows 1-7. Atomic number increases from left to right. Those on the same period have the same number of energy shells. Chemical properties are not all similar. |
Groups | The groups are columns from 1-18. Same number of valence electrons. Chemical properties are very similar. Group 1 is the most reactive. Group 18 is the most inert. |
Happy Stable Atom | Has it outer energy level full. Does not want to bond with other atoms. Helium is the exception. Only has 2 valence electrons. |
Alkali Metals | Highly reactive. They have to bond with something. Very soft. |
Alkali Earth Metals | Fairly reactive. Needs to bond. Serves as important minerals for our body. |
Transitional Metals | Less reactive. Has hard dense metal. Useful building materials. Also used as oxides to make paints and pigment. |
Noble Gases | Nonreactive. Never bonds. Used in light bulbs as "neon". Don't react naturally. |