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41 Cards in this Set
- Front
- Back
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chemistry
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study of matter
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atoms
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smallest piece of an element
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element
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substance containing only one kind of atom
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parts of an atom
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3
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protons
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has a posotive charge and is in the nucleus
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electrons
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has a negative charge and travels around in the nucleus
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nuetrons
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has no charge and is in the nucleus
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atomic mass
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the number of protons and nuetrons in an atom
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shell
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the space around the nucleus
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first shell
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can hold 2 electrons
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second shell
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can hold 8 electrons
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third shell
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can hold more than 8 electrons
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atomic number
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how many protons and are in the nucleus
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models of atoms
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theory of how atoms act in experimints
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neils bohr
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model of atoms
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chemical symbols
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abbreviations forn the name of an element
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periodic table of elements
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the classification system that oranizes elements based upon their atomic numbers and groups them into rows and columns based on their chemical and physical properties
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1st organized by
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atomic weight
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2nd organized by
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rows
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3rd organized by
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columns
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mistake
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organized first by atomic number
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horizontal rows=periods=
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they have the same number of shells
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vertical column=group=
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same number of electrons in outer shell
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families or catogories
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group of elements that elements that poses similar chemical properties and react similarly with other elements
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molecuels
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atoms that join with another atom
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chemical change or reaction
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an atom joins with another atom of a different kind that produces a compound
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decomposition
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break down complex comjpounds into simple compounds
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chemical formula
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shows what the elements make up a compound uses symbols and numbers
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atomic bonding
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chemical bonding
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closed
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shell is completly filled
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covalent bond
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electrons in an outer shell can be given up or shared
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ion
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atom that has gained or lost electrons
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posotive ion
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an atom that has given electrons away
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negative ion
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an atom that has gained electrons
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ionic bond
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when posotive and negative attract
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acids
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have a sour taste and some burn and dissolve metals or digest food
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bases
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taste bitter and feel slippery
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neutral
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niether an acid or base
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indicator
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changes color when exposed to an acid or base
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acids and bases do what
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neutralized eachother
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mendeleev
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the chemist who who developed a way to organize elements
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