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SS2: CHEMISTRY - 3RD TERM

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  1. Hydrogen and its Compounds | Week 1
    7 Topics
    |
    1 Quiz
  2. Oxygen and its Compounds | Week 2
    7 Topics
    |
    1 Quiz
  3. Halogens, Chlorine and its Compounds | Week 3
    7 Topics
    |
    1 Quiz
  4. Hydrogen Chloride and Hydrochloric Acid | Week 4
    5 Topics
    |
    1 Quiz
  5. Nitrogen and Its Compounds | Week 5
    9 Topics
    |
    1 Quiz
  6. Ammonia | Week 6
    9 Topics
    |
    1 Quiz
  7. Sulphur and its Compounds | Week 7
    13 Topics
    |
    1 Quiz
  8. Hydrocarbons | Week 8
    12 Topics
    |
    1 Quiz
  9. Alkanols | Week 9
    4 Topics
    |
    1 Quiz



Lesson 1, Topic 1
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Occurrence and Position of Hydrogen in the Periodic Table

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Topic Content:

  • Occurrence and Position of Hydrogen in the Periodic Table

Hydrogen is a diatomic gas which belongs to group 1 (or group IA) of the periodic table. It makes up approximately 1% of the earth’s crust and is found mostly in a combined form with other elements. It is found combined with carbon in natural gas and petroleum; and in organic compounds like protein, carbohydrates, fats, etc. 

The position of hydrogen is unusual. Hydrogen has one electron on its shell. Consequently, it is considered as belonging to group 1 of the periodic table. Hydrogen also acts like the elements of group 7 when it gains one electron to attend a stable configuration (duplet). For that, it is classified as a member of the halogens. In the modern periodic table, hydrogen is placed in group 1.

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