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34 Cards in this Set
- Front
- Back
What do you call the outer shell electrons?
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Valence electrons
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The term used when two chemicals look different are ___
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Homogeumius
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The term used when two elements look the same is____
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Heterogenius
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Electrons lost or gained called
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Valence number
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Number of infront molecules
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coefficient
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Noble gasses tend to
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Not react with other elements
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Amt of space an object takes up is
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the volume
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Amt of mass per unit of volume
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Density
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Elements found next to eachother
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Mixture
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what increases across a period in the periodic table?
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Atomic size
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How are elements arranged in the modern periodic table?
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Increasing atomic #
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What is a group?
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Same valence # and similar chemical and physical properties
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What is a period
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(Horizantal) Same electron level and increasing mass number
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What is an element
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Composed of 1 type of atom
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Atom
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Smallest part of an element
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Metal
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Malleable, ductile, high melting point, good conducters of heat and electricity
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Non-metal
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No luster, dull appearance, low melting point, bad conducters of heat and electricity
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Mellatoid
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Features both metal and non-metal properties
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What happens when properties of elements combine?
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Loose or gain electrons
Lithium Flouride |
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Molecule
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Elements chemically combined in a definite proportion
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Compound
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Can only be seperated by another chemical reaction
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mixture
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Can easily be seperated
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Coefficient
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Tells you how many molecules are present
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Subscript
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How many atoms of the element are present
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Balance chemical equation
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# and type of atoms that go in and out the same way
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Metals on periodic table
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Left of step
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Non-metals on the periodic table
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Right of step
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Mellatoids on the periodic table
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on or below step
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Atomic size _________ when L-R on periodic table
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Decreases
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Reactivity L-R on periodic table
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Very reactive, less reactive, unreactive
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metallic properties L-R on periodic table
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Metal- Mellatoid- Non-metal
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Matter
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Anything that takes up space
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Measure mass on a
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triple beam balance
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Measure volume of solids and liquids with
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graduated cylinder
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