2011 Science Vocabulary Ch. 2,5

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cg0512
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106817
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2011 Science Vocabulary Ch. 2,5
Updated:
2011-10-06 00:05:34
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Science 2011 Chapter
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Science Vocabulary for Chapters 2 and 5
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  1. uncharged particles in the nucleus
    Neutron
  2. electrically neutral particle that is present in the nucleus of all atoms
    Neutron
  3. has the same mass as a proton
    Neutron
  4. The positively charged central part of the atom
    Nucleus
  5. Negatively charged particles
    Electrons
  6. part of the atom in which electrons move
    Eletron Cloud
  7. The positively charged particles in the nucleus
    Protons
  8. Tells you how heavy an element's atoms are compared with atoms of other elements
    Atomic Mass
  9. Tells you the number of protons in the nucleus of each atom of an element
    Atomic Number
  10. a material that cannot be broken down to simpler substances by ordinary mean
    Element
  11. States that a given compound is always made of the same elements in the same proportion by mass
    Law of Defenite Proportions
  12. A pure substance whose smallest unit is made up of atoms of more than one elemnt
    Compound
  13. A sample of matter that has the same composition and proporties throughout
    Substance
  14. The sum of an atom's protons and neutrons
    mass number
  15. states that matter is neither created nor destroyed, only changed in form
    Law of Conservation of Matter
  16. A small particle that makes up most types of matter
    Atom
  17. Anything that had mass and takes up space
    Matter
  18. Formed when two or more substances come together but don't combine to form a new, pure substance
    Mixture
  19. Atoms of the same element that have different numbers of neutrons
    Isotopes
  20. positively charged, heavy particle contained in the nucleus of all atoms
    Proton
  21. Particle in the nucleus of an atom that carries a positive charge
    Proton
  22. Number of protons in the nucleus of an atom of a specific element
    Atomic Number
  23. Whole number that tells how many protons are in the nucleus of each atom of an element
    Atomic Number
  24. Time needed for one-half the mass of a sample of a radioactive isotope to decay
    Half-life
  25. Can vary from fractions of a second to billions of years
    Half-life
  26. Number of neutrons plus the number of protons in the nucleus of an atom
    Mass Number
  27. Substance that cannot be broken down into simpler substances and whose atoms are exactly alike
    Element
  28. tiny negatively chargd particle that is present in all atoms and that has almost no mass
    Electron
  29. Region surrounding the nucleus of an atom, where electrons are more likely to be found
    Electron Cloud
  30. atoms of the same element that have different numbers of neutrons in their nuclei
    Isotopes
  31. Two or more atoms of the same element that have different numbers of neutrons
    Isotopes
  32. Release of nuclear particles and energy from unstable atomic nucleu
    Radioactive Decay

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