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14 Cards in this Set

  • Front
  • Back
isotopes
atoms that have the same atomic number, but different mass numbers (most elements have two or more naturally occurring isotopes that contribute to its average atomic mass).
Molecule:
an aggregate of at least two atoms in a definite arrangement held together by chemical bonds
Ion
an atom, or group of atoms, that has a net positive or negative chare
Cation
positive ions that are formed by the loss of electrons Na -> N+ 1e-
Anions
negative ions that are formed by the gain of electrons. Cl + 1e- -> Cl-
The Molecular formula
shows that exact number of each element in the smallest unit of a substance
Empirical Formulas
Tells us which elements are present and the simplest whole number ration of their atoms (in some cases, the empirical formula is the same as the molecular formula
Ionic Formulas
Ionic compounds have an arrangement of cations and anions such that they are electrically neutral
Binary Ionic Compounds (Type 1)
Contain metals that form only one cation.
Binary Ionic Compounds (Type II)
Contain metals that form multiple cations
Binary Molecular compounds (Type III)
Contain metals that form multiple cations
Acids
Substance that yields H+ ions in water
Bases
Substance that yields OH- ions in water
Hydrates
Substance that witha specific number of water molecules attached