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Periodic Table

Metals, nonmetals, metalliods

TermDefinition
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.
Created by: 1632030