Periodic table and atomic structure

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  1. 3. electron Electron(s) located in the outermost shell of an atom that is responsible for the formation of chemical bonds
  2. 6. Table made to organize the elements
  3. 7. an arrangement of two or more atoms that share electrons
  4. 8. cloud (orbital) A region around an atomic nucleus defined by a high probability that the atom's electrons will be present in that region.
  5. 10. matter made up entirely of the same atom each on has their own symbol
  6. 13. ability to conduct or move energy or heat
  7. 15. a basic unit of matter consisting of a positively charged nucleus and negatively charged electrons
  8. 16. finds the nucleus and its positive charge and determines that electrons are orbiting the nucleus from a considerable distance.
  9. 17. develops a theory that all matter is composed of solid, indivisible things called atoms, which come in an infinite variety of shapes and sizes
  10. 18. discovers electrons, which he thinks are embedded in a sphere of positive electrical charge.
  11. 20. The positively charged core of an atom, made of protons and neutrons and contains nearly all its mass
  12. 21. develops the quantum mechanical model, in which electrons are not on neat tracks. This model describes the probability of finding electrons in clouds of certain shapes.
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  1. 1. A negatively charged subatomic particle. It can be either free (not attached to any atom), or bound to the positively charged nucleus of an atom
  2. 2. hard, shiny elements that conductivity heat and energy
  3. 4. poor conductors of heat and energy
  4. 5. have some properties of metals and some of nonmetals
  5. 9. mass weight of the atom. Number of protons + number of neutrons (electrons are VERY light in mass)
  6. 11. atomic model builds upon Rutherford’s by showing how electrons can move from one orbit to another, depending on their energies.
  7. 12. number. number of protons in an atom
  8. 13. a distinct substance formed by the chemical union of two or more ingredients
  9. 14. A subatomic particle found in the nucleus of every atom. It has a positive electrical charge
  10. 17. determines the relative weights of atoms, which he thinks are tiny, indestructible particles.
  11. 19. A subatomic particle of about the same mass as a proton, but without an electric charge.