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4 September, 14:14

Explain vakency with suitable example

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  1. 4 September, 14:19
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    The first 20 elements of the periodic table:

    1. H - Hydrogen

    2. He-Helium

    3. Li-Lithium

    4. Be-Beryllium

    5. B-Boron

    6. C-Carbon

    7. N-Nitrogen

    8. O-Oxygen

    9. F-Fluorine

    10. Ne-Neon

    11. Na-Sodium

    12. Mg-Magnesium

    13. Al-Aluminum

    14. Si-Silicon

    15. P-Phosphorus

    16. S-Sulfur

    17. Cl-Chlorine

    18. Ar-Argon

    19. K-Potassium

    20. Ca-Calcium

    The valency of first 20 elements is as follows : -

    1. Hydrogen (H) = 1

    2. Helium (He) = 0

    3. Lithium (Li) = 1

    4. Beryllium (Be) = 2

    5. Boron (B) = 3

    6. Carbon (C) = 4

    7. Nitrogen (N) = 3

    8. Oxygen (O) = 2

    9. Fluorine (F) = 1

    10. Neon (Ne) = 0

    11. Sodium (Na) = 1

    12. Magnesium (Mg) = 2

    13. Aluminium (Al) = 3

    14. Silicon (Si) = 4

    15. Phosphorus (P) = 3, 5

    16. Sulphur (S) = 2

    17. Chlorine (Cl) = 1

    18. Argon (Ar) = 0

    19. Potassium (K) = 1

    20. Calcium (Ca) = 2

    Explanation:

    First 20 elements in the periodic table start with H and end with Ca. The quickest way to remember the number of valence electrons is to form a relationship with the number of the group the element is located in.
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