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Chem 3.1-3.7

pure substances type of matter that has a definite composition
elements simplest pure substances because they are composed of only are kind of atom
compounds two or more elements in the same proportion
mixtures two or more substances that are pysically mixed, but not chemically combined
types of mixtures homogeneous & heterogeneous
homogeneous mixture aka solution; composition is uniform throughout a sample (salt water)
heterogeneous mixtures components do not have a uniform composition throughout the sample (oil & water, raisins in a cookie)
chemical symbols one- or two-letter abbreviations for the names of the elements
physical properties characteristics that can be observed or measured w/o affecting the identity of an element (shape, color, odor, taste, density, hardness, melting point, boiling point)
periodic table the arrangement of elements created by Dmitri Mendeleev
period horizontal rows in the periodic table
group vertival columns on the periodic table
atom the smallest particle of an element that retains the characteristics of that element
nucleus positively charged region at the center of the atom
amu (atomic mass unit) used in expressing masses of neutrons, protons, ect
atomic number equal to the protons
mass number protons + neutrons= mass number
isotopes atoms of the same element that have different numbers of neutrons
atomic mass average of the mass of isotopes of an elements
valence electrons outermost electrons
group numbers (1A-8A); indicates the number of valence electrons in an element
atomic radius the distance from the nucleus to the valence electrons
ionization energy energy needed to remove the least tightly bounded electron from an atom in the gaseous state.
Created by: adiya117