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SS1: CHEMISTRY - 1ST TERM

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  1. Introduction to Chemistry and Laboratory Apparatus | Week 1
    5Topics
    |
    1 Quiz
  2. Nature of Matter | Week 2
    3Topics
    |
    1 Quiz
  3. Separation Techniques I | Week 3
    1Topic
    |
    1 Quiz
  4. Separation Techniques II | Week 4
    5Topics
    |
    1 Quiz
  5. Particulate Nature of Matter I | Week 5
    5Topics
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    1 Quiz
  6. Particulate Nature of Matter II | Week 6
    9Topics
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    1 Quiz
  7. Symbols, Formulae & Oxidation Number | Week 7
    7Topics
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    1 Quiz
  8. Laws of Chemical Combination | Week 8
    4Topics
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    1 Quiz
  9. Chemical Equation & Chemical Combination (Chemical Bonding) I | Week 9
    4Topics
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    1 Quiz
  10. Chemical Combination (Chemical Bonding) II | Week 10
    4Topics
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    1 Quiz
  11. Chemical Combination (Chemical Bonding) III & Shapes of Covalent Molecules | Week 11
    3Topics
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    1 Quiz
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Isotopy is a phenomenon whereby atoms of an element exhibit the same atomic number but different mass number. This is due to the difference in the number of Neutrons present in these atoms.

Isotopes are atoms of the same element with the same atomic number but different mass number. Hydrogen the lightest element has three Isotopes.

Isotopes of Hydrogen

IsotopeNumber of ProtonsNumber of neutronsMass Number
Protium1__1
Deuterium112
Tritium123

Isotopes of Some Common Elements

ElementNumber of ProtonsNumber of NeutronsMass NumberIsotope
Oxygen8816\( \scriptsize _{8} ^{16} \textrm {0} \)
8917\( \scriptsize _{8} ^{17} \textrm {0} \)
81018\( \scriptsize _{8} ^{18} \textrm {0} \)
Carbon 6612\( \scriptsize _{6} ^{12} \textrm {C} \)
6713\( \scriptsize _{6} ^{13} \textrm {C} \)
6814\( \scriptsize _{6} ^{14} \textrm {C} \)
Neon 101020\( \scriptsize _{10} ^{20} \textrm {Ne} \)
101121\( \scriptsize _{10} ^{21} \textrm {Ne} \)
101222\( \scriptsize _{10} ^{22} \textrm {Ne} \)
Chlorine171835\( \scriptsize _{17} ^{35} \textrm {Cl} \)
172037\( \scriptsize _{17} ^{37} \textrm {Cl} \)
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