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34 Cards in this Set
- Front
- Back
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matter |
anything that has mass and takes up space. |
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element |
simplest pure substance that cannot be broken down into any other substance. |
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compound |
pure substance made up of two or more elements that are combined chemically in a specific ratio |
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mixture |
two or more substances that are in the same place but are not chemically combined |
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atom |
smallest particle of an element |
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scientific theory |
well tested idea that explains and connects wide range of observations |
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model |
physical or other representation of an idea to help people understand what they cannot observe directly |
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electron |
negatively charged particle of an atom |
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nucleus |
positively charged region in the center of an atom |
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proton |
positively charged particle in the nucleus of an atom |
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Valence electrons |
electrons in the highest level |
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chemical bond |
the force of attraction that holds two atoms together |
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electron dot diagram
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includes the symbol for the elementsurrounded by dots.
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symbol
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the representation of an element |
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atomic number
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the number of protons in the nucleus of an atom |
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period
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A row of elements across the periodictable
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group or family
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Elements in the same column
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noblegases
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The Group 18 elements
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halogens
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The elementsin Group 17
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alkali metal
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Group 1
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ion |
an atom or group ofatoms that has an electric charge.
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poly atomic ion |
Ions that are made ofmore than one atom
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ionic bond |
the attraction between two oppositely chargedions.
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ionic compound |
A compound that consists of positiveand negative ions, such as sodium chloride
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chemical formula |
combination of symbols that shows theratio of elements in a compound.
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subscript |
tells you the ratio ofelements in the compound.
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crystal |
The ions form an orderly, threedimensionalarrangement
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covalent bond |
The chemical bond formed when two atoms share electrons
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molecule |
neutral group of atoms joined by covalent bonds.
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double bond |
two atoms share two pairs of electrons
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triple bond |
atoms share three pairs of electrons.
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molecular compound |
compound that is composed ofmolecules.
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polar bond |
A covalent bond in which electrons are sharedunequally
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non-polar bond |
electrons are shared equally
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