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10th Class Science Periodic Classification of Elements Question Bank Periodic Classification of Elements

  • question_answer
    Find the atomic number of an element belonging to group IA and the 3rd period in the periodic table.

    A) 3                                            

    B) 11     

    C) 19 

    D) 20

    Correct Answer: B

    Solution :

    The element belonging to 3rd period has 3 shells and as it belongs to IA group, it has valence electron in M shell. EC of element = 2, 8, 1 = 11. It belongs to sodium.


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