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9th Class Science Structure of the Atom Question Bank 9th CBSE Science Structure of the Atom

  • question_answer
                    The given figure depicts the atomic structure of an atom of an element 'X' Write the following information about the            element 'X'.                                      (a) Atomic number of 'X'                          (b) Atomic mass of 'X'                               (c) Valence electrons                                     (d) Valency of 'X' (e) 'X' should be metal or non-metal.  

    Answer:

                      (a) Atomic number = Number of protons = 8 (b) Atomic mass = Number of protons + Number of neutrons = 8 + 10 = 18 u (c) Valence electrons = 6 (d) Valency of 'X' =8-6=2 (e) 'X' should be non-metal because there are six valence electrons hence it will take two more electrons to complete its outer most shell.


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