Chapter 05 vocab.txt

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Chapter 05 vocab.txt
2014-04-20 22:28:53
CHEM 1405
Atoms, Molecules, and Subatomic Particles
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  1. Molecule
    A group of 2 or more atoms that function as a unit because the atoms are tightly bound together
  2. Diatomic molecule
    A molecule that contains two atoms
  3. Triatomic molecule
    A molecule that contains three atoms
  4. Homoatomic molecule
    A molecule in which all of the atoms present are the same kind. By definition, a homoatomic molecule must be an element
  5. Heteroatomic molecule
    A molecule in which two or more different kinds of atoms are present. By definition a heteroatomic molecule must be a compound
  6. Molecular compound
    Compounds that have heteroatomic molecules as their basic structural unit
  7. Ions
    Atoms are not collected together into discrete heteroatomic molecules
  8. Ionic compound
    A compound that contains ions (most compounds that contain metal)
  9. Atomic number
    The number of protons in the nucleus of an atom
  10. Mass number
    The sum of the number of protons and the number of neutrons in the nucleus of an atom
  11. Element
    A pure substance in which all atoms present have the same comic number, that is, all atoms have the same number of protons
  12. Isotope
    Atoms of an element that have the same number of protons and electrons but have different numbers of neutrons. Isotopes will always have the same atomic number but different mass numbers
  13. Percent abundance
    The percent of atoms in a naturally occurring sample of a pure elements that are a particular isotope of that element
  14. Monoisotopic element
    An element that only has one naturally occurring form or isotope
  15. Isobar
    Atoms of different elements that have the same mass number. Isobars will have the same mass number but different atomic numbers
  16. Atomic mass
    A weighted average mass that takes into account the existence of isotopes and their relative abundances