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30 Cards in this Set

  • Front
  • Back
law of conservation of mass
mass is neither created not destroyed
law of definite proportion
a given comppund always contains exactly the same proportion of elements by mass
law of multiple proportions
states that when two elements form a series of compounds, the ratios of the masses of the second element that combine with the one gram of the first element can always be reduced to small whole numbers
atomic masses/weights
the average mass of the atoms in a naturally occurring element
mass number
the total number of protons and neutrons
Avogadro's hypothesis
at the same temperature and pressure, equal volumes of different gases contain the same number of particles
cathode-ray tube
emanate the negative electrode
negatively charged particles
emission of radiation by the uranium
nuclear atom
an atom with a dense center of positive charge
the small dense center of positive charge in n atom
have a positive charge particle equal to the magnitude to the electron's negative charge
have virtually the same mass as a proton but no charge
atoms with the same number of protons but different numbers of neutrons
atomic number
the number of protons in the nucleus of an atom
chemical bond
the forces that hold atoms together in compounds
covalent bond
bonds that share electrons
collection of atoms
chemical formula
the symbols for the elements are used to indicate the types of atoms present and subscripts are used to indicate the relative number of atoms
structural formula
individual bonds are shown using lines
space-filling model
shows the relative sizes of the atoms as well as their relative orientation in the molecule
ball and stick model
represent molecules
an atom or group of atoms that has a net positive or negative charge
a positive ion
a negative ion
ionic bond
force of attraction between oppositely charged ions
ionic solid (salt)
a solid consisting of oppositley charged ions
polyatomic ion
an ion containing a number of atoms
periodic table
shows all the known elements and gives a good deal of information about each
tend to lose electrons to form positive ions