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SS1: CHEMISTRY - 1ST TERM

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  1. Introduction to Chemistry and Laboratory Apparatus | Week 1
    5 Topics
    |
    1 Quiz
  2. Nature of Matter | Week 2
    3 Topics
    |
    1 Quiz
  3. Separation Techniques I | Week 3
    1 Topic
    |
    1 Quiz
  4. Separation Techniques II | Week 4
    5 Topics
    |
    1 Quiz
  5. Particulate Nature of Matter I | Week 5
    5 Topics
    |
    1 Quiz
  6. Particulate Nature of Matter II | Week 6
    9 Topics
    |
    1 Quiz
  7. Symbols, Formulae & Oxidation Number | Week 7
    7 Topics
    |
    1 Quiz
  8. Laws of Chemical Combination | Week 8
    4 Topics
    |
    1 Quiz
  9. Chemical Equation & Chemical Combination (Chemical Bonding) I | Week 9
    4 Topics
    |
    1 Quiz
  10. Chemical Combination (Chemical Bonding) II | Week 10
    4 Topics
    |
    1 Quiz
  11. Chemical Combination (Chemical Bonding) III & Shapes of Covalent Molecules | Week 11
    3 Topics
    |
    1 Quiz



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Atomic Number (Z)

The atomic number of an element is the number of protons in one atom of that element. The number of protons is equal to the number of electrons. When the number of protons is not equal to the number of electrons, we have ions. This occurs by increasing or decreasing the number of electrons in a neutral atom.

Mass Number (A)

The mass number of an element is the sum of the Protons and Neutrons.

Atomic Number, Mass Number

 Thus, the atoms of Hydrogen, Oxygen and Sodium can be written as:

\( \scriptsize _{1} ^{1} \textrm {H} \), \( \scriptsize _{8} ^{16} \textrm {0} \), \( \scriptsize _{11} ^{23} \textrm {Na} \)

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