Science chapter 5

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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 oisitively charged centre of an atom
  5. Proton
    A positively charged particle that is part of everystomic nucleus
  6. Neutron
    An uncharged particle that is part pf 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 number of neutrons
  11. Bohr-rutherford diagram
    a model of the atom in which a central positive nucleus is surrounded by electrons in energy levels
  12. Atomic mass
    The average mass of the naturally occuring isotopes of an element
  13. Periodic table
    A system for organizing the elements into columns and rows, so that elements with similar properties are in the same columns
  14. Metal
    Typically, an element that is hard, shiny, malleable, and ductile, and is a good conductor of heat and electricity
  15. Non-metal
    typically, an element that is not shiny, malleable, or ductile, and is a poor conductor of heat and electricity
  16. Metalloids
    An element that shares some properties with metals and some properties with non-metals
  17. Period
    A horizontal row of elements in the periodic table
  18. Group
    a vertical column of elements in the periodic table
  19. Alkali metal
    Found in Group 1. They have low melting points and are highly reactive.
  20. Alkaline earth metal
    Found in Group 2. They are also highly reactive, but less so than Alkali metals. They are often used in fireworks since they produce colourful flames.
  21. Halogens
    Found in group 17. These non-metals are highly reactive and extremely corrosive.
  22. Noble gases
    Found in group 18. These non-metals are all odourless, colourless gases at room temperature. However, they are non-reactive.
  23. Valence electron
    An electron in the outermost occupied energy level of an atom
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Science chapter 5
2015-01-23 19:49:33

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