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17 Cards in this Set
- Front
- Back
Atom
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Smallest particle of an element; building block of matter.
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Atomic Number
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Th number of protons in an atoms nucleus.
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Bohr Diagram
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small positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus.
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chemical symbol
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natural elements with symbols of one of two letters, first letter capital, second letter lowercase.
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electron
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a stable subatomic particle with a charge of negative electricity.
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energy level
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fixed amount of energy that a system described by quantum mechanics, such as a molecule, atom, electron, or nucleus, can have.
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family
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a group that is related to one another.
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isotope
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each of two or more forms of the same element that contain equal number of protons but different numbers of neutrons in their nuclei.
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mass number
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the sum of the number of neutrons and protons in an atomic nucleus
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metalloid
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an element whose properties are intermediate between those of metals and solid nonmetals or semiconductors.
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metal
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a solid material that is typically hard, shiny, malleable,fusible, and ductile, with good electrical and thermal conductivity.
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neutron
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a subatomic particle of about the same mass as a proton but without an electrical charge.
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non-metal
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non-metals never exhibit metallic properties.
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nucleus
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The central and most important part of an object.
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period
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elements are arranged in a series of rows so that those with similar properties appear in vertical columns.
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Periodic Table
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arrangement of the chemical elements according to atomic number
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proton
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a stable particle with positive charge equal to the negative charge of an electron
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