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SS1: PHYSICS – 3RD TERM

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  1. Production of Electric Current | Week 1
    6 Topics
    |
    1 Quiz
  2. Electric Current | Week 2
    5 Topics
    |
    1 Quiz
  3. Electrical Resistance of a Conductor | Week 3
    5 Topics
    |
    1 Quiz
  4. Particulate Nature of Matter | Week 4
    5 Topics
    |
    1 Quiz
  5. Crystalline and Non-crystalline Substances | Week 5
    3 Topics
    |
    1 Quiz
  6. Elastic Properties of Solids | Week 6 & 7
    4 Topics
    |
    1 Quiz
  7. Fluids at Rest & in Motion | Week 8 & 9
    6 Topics
    |
    1 Quiz
  8. Solar Collector
    3 Topics
    |
    1 Quiz



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The word atom comes from the Greek word atomos which means indivisible.

An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical compound. Every solid, liquid, gas and plasma is composed of neutral or ionised atoms.

An atom consists of a central nucleus and electrons. The nucleus of an atom is made up of protons and neutrons. The proton is positively charged while the neutron is neutral. The nucleus is surrounded by electrons which are negatively charged, light, and have a mass of about \( \frac {1}{1840} \)

Atomic Structure
Atomic Structure.

The electrons revolve around the nucleus and are held in place due to the electrostatic force of attraction between the nucleus and the electron. In a neutral atom, there must be an equal number of protons and electrons.

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