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30 Cards in this Set
- Front
- Back
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element
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substance that has only one type of atom
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compound
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substance that is made of two or more elements combined in a specific ratio
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mixture
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when two or more substances are combined so that each substance maintains its own properties
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heterogenous mixture
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a mixture in which the components are unevenly mixed
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homogenous mixture
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a mixture in which the components are evenly mixed
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physical property
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any characteristic of a material that you can observe w/o changing the material being observed
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chemical property
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a characteristic of a material that describes how it reacts to form new substances
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what dictates if a mixture is a solution, suspension or colloid?
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particle size
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electrical charge of an atom is either ____ or ____
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neutral or zero
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the electrical charge of an atom's nucleus is _________
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positive
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most of the mass of an atom comes from ___________
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the nucleus of the atom
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most of the volume of the atom comes from the________-
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electron cloud of the atom
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the nucleus of an atom contains the subatomic particles _______ and _________
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protons and neutrons
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the subatomic particles called electrons travel around the nucleus in orbital shapes called ___, ___, ___ and ___
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s, p, d and f
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atomic number
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the number of protons in the nucleus
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mass number
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the number of protons and neutrons in an atoms nucleus
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isotopes
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atoms with the same atomic number but a different neutron count (or mass number)
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valence electron
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an electron in the outer energy level of an atom
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valence shell
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the outermost shell of an atom
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atoms on the periodic tables are arranged by increasing _______
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proton count or atomic number
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what indicates the number of valence electrons on the periodic table?
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group number
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period number
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indicates the number of electron energy levels an atom utilizes
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transition elements
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-represent the filling of the p suborbital
-represent the elements in group 3-12 |
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alkali metals
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group one
most chemically active |
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group 2, represents adding the second electron in the s suborbital
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alkaline earth
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noble gases
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group 18
full valence shells |
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halogens
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highly reactive nonmetals
group 17 |
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the most chemically active nonmetals are found in the ______ ______ portion of the periodic table
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upper right
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most chemically active metals are gound on the ______ ______ portion of the periodic table
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lower left
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metalloids
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elements that have properties of metals and nonmetals
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