AQA Chemistry 1 Atoms and the Periodic Table

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HLHSscience
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223711
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AQA Chemistry 1 Atoms and the Periodic Table
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2013-06-13 08:50:57
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AQA Chemistry Atoms Periodic Table
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AQA Chemistry 1 Atoms and The Periodic TAble
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  1. What is an element?
    A substance made of one type of atom
  2. What is a compound?
    A substance made of 2 or more elements chemically combined
  3. Name the 3 sub-atomic particles.
    protons

    neutrons

    electrons
  4. How many protons, neutrons and electrons are in an atom of sodium? 
    (atomic number 11 and mass number 23)
    • Protons  11
    • Neutrons  23-11=12
    • Electrons  11
  5. Why do atoms have the same number of protons and electrons?
    So the charges balance and the atom is neutrall overall
  6. What is the charge on a proton, neutron and electron?
    • proton   +1
    • neutron  0 (neutral)
    • electron   -1
  7. What is the electron arrangement of these atoms?

    a)  carbon (6 electrons)

    b) chlorine  (17 electrons)
    a) 2.4

    b)  2.8.7
  8. How are elements arranged in the periodic table?
    in order of atomic number
  9. Why do elements in the same group have similar chemical properties?
    same number of outer electrons
  10. Why are the elements in Group O unreactive?
    they have a full outer shell of electrons
  11. What is unusual about the elements in Group 1?
    They are VERY reactive
  12. Which gas is produced when sodium reacts with water?
    hydrogen

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