Chemistry- Chapter 5

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Chemistry- Chapter 5
2014-05-07 18:02:24

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  1. Atom
    The smallest part of an element that retains the identity of the element
  2. Electrons
    A negatively charge particle within the atom
  3. Subatomic particles
    A particle that is smaller than the atom
  4. Nucleus
    In chemistry, the positively charged centre of an atom
  5. Protons
    A positively charge particle that is part of every atomic nucleus
  6. Energy levels
    A possible level of energy an electron can have in an atom
  7. atomic number
    The number of protons in the nucleus of an atome
  8. Mass number
    the sum of the number of protons and the number of neutrons in the nucleus of an atoms
  9. Isotopes
    One of two or more forms of an element that have the same number of protons by a different number of neutron
  10. Bohr-Rutherford model
    A model of the atom in which a central positive nucleus is surrounded by electrons in energy levels
  11. Atomic mass
    The average mass of the naturally occurring isotopes of an element
  12. Periodic table
    A system for organising the elements into columns and rows so that elements with similar properties are in the same colomn
  13. Metal
    Typically an element that is hard, shiny, malleable, and ductile, and is a good conductor of heat and electricity
  14. Non-metal
    Typically, and element that is not shiny, malleable, and ductile, and is a poor conductor of heat and electricity
  15. Metalloid
    An element that shares some properties with some non metals and some metals
  16. Period
    a horizontal row in the periodic table of elements
  17. Group
    A vertical column of elements in the periodic table
  18. Allende electrons
    An electron in the outermost occupied energy level of an atom
  19. Alkali metals
    Far left group 1. Low melting point. Very reactive
  20. Alkaline metals
    Group 2. Very reactive but less reactive than alkali metals.
  21. Halogens
    Group 17. Highly reactive and extremely corrosive
  22. Noble gases
    Group 18. More reactive than group 17