Chapter 5 chemisty glossary terms

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Aamir101
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Chapter 5 chemisty glossary terms
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2012-12-02 11:53:13
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Chapter 5 chemisty glossary terms for Mrs.Day
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  1. Atom
    The smallest particle of an elemement that retains the identity of the element
  2. Electron
    A negatively charged particle
  3. Subatomicle particles
    A particle that is smaller than the atom
  4. Nucleus
    In chemistry, the positivley charge center of an atom
  5. Proton
    A positively charged particle that is every part of every atomic nucleus
  6. Neutron
    An uncharged particle that is part of almost every atomic nucleus
  7. Energy levels
    A possible level of energy an electron can have in an atom
  8. Atomic number
    The number of protons in the nucleus of an atom
  9. Mass number
    The sum of the number of protons and the number of neutrons in the nucleus of an atom
  10. Isotope
    One of two or more forms of an element that have the same number of protons but a different numbers of neutrons
  11. Bohr-Rutherford diagrams
    A model of the atom in which a central positive nucleus is surronded by electrons in energy levels
  12.  Atomic mass
  13. Atomic mass
    The average mass of naturally occuring isotopes of an element
  14. Periodic table
    A system of organizing the elements into coloums and rows, so that elements with similar properties are in the same coloumn
  15. Metal
    Typically an element that is hard,shiny,malleable,and ductile, and is a good conductor of heat and electricity
  16. Non-metals
    Typicallly, an element that is not shiny, malleable, or ductile and is a poor conductor of heat and electricity
  17. Metalloids
    An element that shares some properties with metals and some properties with non-metgals
  18. Period
    A horizantal row of elements in the periodic table
  19. Group
    A verticle column of elements in the periodic table
  20. Alkali metals
    Metals that are the elements in group 1( except for hydrogen) These metals have low melting points, they are soft, are highley reative to water and oxygen
  21. Alkaline-Earth metals
    Metals that are the elements in group 2, Highley reactive, but less reactive then Alkali metals, when heated they will burn in air, producde bright colourful flames
  22. Halogens
    Meatals that are in the element group 17, Non-meatals are highley reactive and extremely corrosive,As you move from flourine to iodine the melting point increase
  23. Noble gasses
    Are the elements in group 18, Non-meatals are all ouderless, colourless gasses at room temperature, non- reactive
  24. Valance electrons
    An electron in the outermost occupied energy level of an atom

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