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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 present in non- metals in their outermost shell?

    A)  1, 2 or 3 

    B)                                                         8, 9 or 10                            

    C)                         10, 20 or 30       

    D)                         4, 5, 6 or 7          

    Correct Answer: D

    Solution :

    Non-metals generally contain 4,5,6,7 or 8 electrons in their outermost orbit or shell.
    (i) Carbon 2, 4
    (ii) Nitrogen 2, 5
    (iii) Oxygen 2, 6
    (iv) Fluorine 2, 7
    The number of valence electrons in carbon, nitrogen, oxygen and fluorine are 4, 5, 6, 7 respectively.


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