Science - Unit 3 chemistry chapter 5

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Science - Unit 3 chemistry chapter 5
2014-05-05 22:15:29

chemisty glossary terms
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  1. atom
    the smallest particle of an element that retains the identity of the element
  2. Electron
    a negatively charged particle within the atom
  3. Subatomic particle
    a particle that is smaller than the atom
  4. nucleus
    in chemistry, the positively charged centre of an atom
  5. proton
    a positively charged particle that is part of every atomic nucleus
  6. neutron
    an uncharged particle that is part of almost every atomic nucleus
  7. atomic number
    the number of protons in the nucleus of an atom
  8. mass number
    the sum of the number of protons and the number of neutrons in the nucleus of an atom
  9. isotope
    one of two or more forms of an element that have the smae number of protons but a different number of neutrons
  10. Atomic mass
    the average mass of the naturally occuring isotopes of an elecment
  11. periodic table
    a system for organizing the elements into columns and ros, so that elements with similar properties are in the same column
  12. metal
    typically, an element that is hard, shiny, malleable, and ductile, and is a good conductor of heat and electricity
  13. non-metal
    typically, an elecment that is not shiny, malleable, or ductile, and is a poor conductor of heat and electricity
  14. metalloid
    an element that shares some properties with metals and some properites with non-metals
  15. Valence electron
    an electtron in the outermost occupied energy level of an atom
  16. Period
    a horizontal row of elements in the periodic table
  17. groups
    a vertical column of elements in the periodic table
  18. Alkali metals
    metals in group 1, have low melting points, malleable, highly reactive
  19. Alkaline-Earth metals
    metals in group 2, less reactive than group 1 metals, high combustibility
  20. Noble gases
    elements in group 18, odourless, colourless, non-reactive
  21. Halogens
    elements in group 17, highly reactive, extremly corrosive
  22. Bohr-Rutherford diagram
    diagram of the atom including subatomic particles in the nucleus with correct number of protons and neutrons, with electrons around the nucleus in a planetary formation including energy levels