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Atoms and Elements Notes
|the basic building blocks of matter, because they are the smallest particles that can have the same properties as the stuff they make up.
|the subatomic particles that have a positive electric charge, and they are found in the nucleus (or center) of an atom.
|another subatomic particle that is also found in the nucleus (or center) of an atom, and they have no electric charge.
|the third subatomic particle that have a negative charge and are found outside the nucleus in a region called the electron cloud.
|a pure substance that is made up of only one type of atom.
|a one-or-two letter abbreviation that represents an element. The first letter is always capitalized, and all other letters are lowercase.
|a characteristic of a substance that can be observed and measured without changing the identity of the substance.
|Most of the elements are classified as metals, which are found to the left of the zig-zag line on the Periodic Table. Physical Properties: solid, shiny, malleable, great conductors of heat and electricity.
|Nonmetals appear to the right of the zig-zag line on the Periodic Table. (Except for hydrogen.) Physical Properties: gas, dull, brittle, poor conductors of heat and electricity.
|Metalloids appear between metals and nonmetals along the zig-zag line on the Periodic Table. They have some properties of metals and some properties of nonmetals. Physical Properties: solid, less shiny than metals, less malleable