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SS2: CHEMISTRY - 1ST TERM

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  1. Periodicity and Periodic Table I | Week 1
    5 Topics
    |
    1 Quiz
  2. Quantum Numbers Orbitals & Electrical Structure | Week 2
    6 Topics
    |
    1 Quiz
  3. Periodicity and Periodic Table II | Week 3
    12 Topics
    |
    1 Quiz
  4. Periodicity and Periodic Properties III | Week 4
    11 Topics
    |
    1 Quiz
  5. Periodicity and Periodic Properties IV | Week 5
    5 Topics
    |
    1 Quiz
  6. Mass-Volume Relationship in Reaction | Week 6
    8 Topics
    |
    1 Quiz
  7. Types of Reactions: Oxidation and Reduction | Week 7 & 8
    7 Topics
    |
    1 Quiz
  8. Oxidation – Reduction Reaction II | Week 9
    3 Topics
    |
    1 Quiz
  9. Electrode Potential and Electrochemical Cells I | Week 10
    6 Topics
    |
    1 Quiz
  10. Electrode Potential and Electrochemical Cells II | Week 11
    5 Topics
    |
    1 Quiz
  11. Electrolysis I | Week 12
    8 Topics
    |
    1 Quiz
  12. Electrolysis II | Week 13
    8 Topics
    |
    1 Quiz



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Topic Content:

  • The Periodic Table Basic Features
    • Groups
    • Periods

The modern periodic table is divided into eight vertical columns known as groups and seven horizontal rows known as periods.

period

Groups:

Groups 1 to 8(0) which constitute the chemical families are named as follows

Group 1Alkali metals
Group 2Alkaline earth metals
Group 3Boron family
Group 4Carbon family
Group 5Nitrogen family
Group 6Oxygen family
Group 7Halogens
Group 0Rare gases or inert gases

Elements in the same group have the same number of valence electrons in their respective atoms.  Example, Group 1 Elements 3Li → 2, 1, 11Na → 2, 8, 1, 19K → 2, 8, 8, 1.  They all have one electron in their outermost shell.  The group an element belongs to corresponds to the number of electrons in the outermost shell (except for group 0 elements)

The elements which occur between Alkaline earth metals and the Boron family are regarded as transition elements. The elements in Groups 3 – 7 are known as representative elements.

version periodic table elements e1699194968441

Periods:

Elements are arranged in horizontal rows according to periods. The periods are numbered from 1 to 7. Elements in the same period have the same number of electron shells.

e.g. 3Li → 2, 1, 4Be → 2, 2, 5B → 2, 3, 6C → 2, 4, 7N → 2, 5. 8O → 2, 6, 9F → 2, 7, 10Ne → 2, 8.

The number of valence electrons of the elements in the same period increases progressively by one across the period from left to right.

Period 1 contains only two elements; Hydrogen and Helium. They have only one electron shell; 1H → 1, 2He → 2;

Period I – their elements occupy the K shell.

Period II – their elements occupy K, L shell

Period III – their elements occupy K, L, M shell

Period IV – their elements occupy K, L, M, N shell.

bhors atom model

The elements in periods 6 and 7 are known as lanthanide and actinide series. They are also known as inner transition elements.

periodic table
Modern Periodic Table
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