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17 Cards in this Set

  • Front
  • Back
A substance that consists of identical atoms (ex. carbon, hydrogen)
A pure substance made up of two or more elements in fixed ratio to mass (ex. water)
A combination of two or more pure substances (ex. blood, gasoline)
Tiny, indivisible particles that make up all matter
A tightly bound combination of two or more atoms that act as single unit
Law of conservation of mass
Matter can neither be created nor destroyed
Law of constant composition
Any compound is always made up of elemtns in the same proportion by mass
Monatomic elements
Elements that consist of single atoms that are not connected to each other
Diatomic elements
Two atoms of the same element per molecule - Hydrogen, Nitrogen, Flourine, Chlorine, Bromine, Oxygen and Iodine
Polyatomic elements
More than three atoms per molecule
A subatomic particle with a charge of +1 and a mass of approximately 1 amu: it is found in the nucleus
A subatomic particle with a charge of -1 and a mass of approximately .0005 amu: it is found in the space surrounding the nucleus
A subatomic particle a mass of approximately 1 amu and a charge of zero: it is found in the nucleus
Mass Number
Sum of the number of protons and neutrons in the nucleus
Atomic number
Number of protons in the nucleus of an atom
Atoms with the same number of protons but a different neutrons
Atomic weight
A weighted average of the masses (in amu) of its isotopes found on the Earth