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basic Chemistry
yea im sexy
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Biology
10th Grade
02/27/2009

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Term
atom
Definition
the smallest component of an element having the chemical properties of the element, consisting of a nucleus containing combinations of neutrons and protons and one or more electrons bound to the nucleus by electrical attraction; the number of protons determines the identity of the element.
Term
proton
Definition
positive charge
Term
neutron
Definition
neutral charge
Term
electron
Definition
negative charge
Term
elements
Definition
Chemistry. one of a class of substances that cannot be separated into simpler substances by chemical means. See also chart under periodic table.
Term
atomic number
Definition
the number of positive charges or protons in the nucleus of an atom of a given element, and therefore also the number of electrons normally surrounding the nucleus.
Term
mass number
Definition
the integer nearest in value to the atomic weight of an atom and equal to the number of nucleons in the nucleus of the atom.
Term
molecule
Definition
Chemistry, Physics. the smallest physical unit of an element or compound, consisting of one or more like atoms in an element and two or more different atoms in a compound.
Term
compound
Definition
a pure substance composed of two or more elements whose composition is constant.
Term
mixture
Definition
an aggregate of two or more substances that are not chemically united and that exist in no fixed proportion to each other.
Term
homogeneous
Definition
corresponding in structure because of a common origin.
Term
heterogenous
Definition
having its source or origin outside the organism; having a foreign origin.
Term
solution
Definition
such a substance, as dissolved sugar or salt in solution.
Term
solvent
Definition
having the power of dissolving; causing solution.
Term
solutes
Definition
A substance dissolved in another substance, usually the component of a solution present in the lesser amount.
Term
suspension
Definition
the state in which the particles of a substance are mixed with a fluid but are undissolved
Term
colloidial dispersion
Definition
A colloid is a type of mechanical mixture where one substance is dispersed evenly throughout another.
Term
dalton
Definition
A unit of mass equal to 1/12 the mass of the most abundant isotope of carbon, carbon 12, which is assigned a mass of 12. Also called dalton
Term
electron cloud
Definition
the group of electrons revolving around the nucleus of an atom; a cloudlike group of electrons
Term
atomic nucleus
Definition
the central core of an atom, composed of protons and neutrons, constituting most of its mass but only a small part of its volume.
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