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Unit 3

Atoms and Elements Notes

TermDefinition
Atoms the basic building blocks of matter, because they are the smallest particles that can have the same properties as the stuff they make up.
Protons the subatomic particles that have a positive electric charge, and they are found in the nucleus (or center) of an atom.
Neutrons another subatomic particle that is also found in the nucleus (or center) of an atom, and they have no electric charge.
Electrons the third subatomic particle that have a negative charge and are found outside the nucleus in a region called the electron cloud.
element a pure substance that is made up of only one type of atom.
chemical symbol a one-or-two letter abbreviation that represents an element. The first letter is always capitalized, and all other letters are lowercase.
physical property a characteristic of a substance that can be observed and measured without changing the identity of the substance.
Metals: 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: 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: 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
Created by: brainybunch6
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