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SS3: CHEMISTRY - 2ND TERM

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  1. Quality of Petrol (Octane Number)| Week 1
    1 Topic
    |
    1 Quiz
  2. Natural Gas | Week 2
    3 Topics
    |
    1 Quiz
  3. Introduction to Metals | Week 3
    3 Topics
    |
    1 Quiz
  4. The Alkali Metals | Week 4
    4 Topics
    |
    1 Quiz
  5. Alkaline Earth Metals | Week 5
    4 Topics
    |
    1 Quiz
  6. Aluminium & Tin | Week 6
    3 Topics
    |
    1 Quiz
  7. Transition Metals of the First Series | Week 7
    4 Topics
    |
    1 Quiz
  8. Ethical, Legal & Social Issues | Week 8
    3 Topics
    |
    1 Quiz
  9. Fats & Oils - Soaps & Detergents | Week 9
    4 Topics
  10. Giant Molecules | Week 10
    6 Topics



Lesson 5, Topic 1
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The Alkaline Earth Metals: General Properties

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Alkaline Earth Metals

Group 2 elements are called alkaline earth metals. They include magnesium, calcium, strontium, and barium.

alkaline earth metals  - periodic table

These elements have two electrons in the valence shell of their atoms and form the oxidation state of +2 in their compounds. They are good reducing agents. Alkaline earth metals have smaller atomic and ionic radii compared to the corresponding members of the alkali metals.

On moving down the group, the radii increase due to a gradual increase in the number of the shells and the screening effect. Alkaline earth metals are less reactive than alkali metals. However, reactivity increases down the group of the elements. Alkaline metals form mainly electrovalent bonds.

1. Melting and Boiling Points: The melting and boiling point of alkaline earth metals are characteristically low and do not show regular trends down the group. 

2. Ionization Energy: Due to the fairly large size of the atoms, alkaline earth metals have low ionization energies which decreases down the group as atomic size increases. 

3. Density: Alkaline earth metals are denser and harder than the alkali metals of group-1.

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