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8th Class Science Materials : Metals and Non-metals Question Bank Materials : Metals and Non-metals

  • question_answer
    How many electrons are generally present in metals in their valence shell?

    A)  1, 2 or 3                              

    B)                         7, 8 or 9                              

    C)                         10, 11 or 12       

    D)                         20, 30 or 40       

    Correct Answer: A

    Solution :

    Metals generally have 1, 2 or 3 electrons in their outermost orbit or valence shell. e.g.,
    (i) Sodium - (Na) - 2, 8, 1
    (ii) Magnesium (Mg) - 2, 8, 2
    (iii) Aluminium - (Al) - 2, 8, 3.
    The number of valence electrons in sodium, magnesium and aluminium metals are 1, 2 and 3 respectively.


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