10th Class Science Solved Paper - Science-2016 Outside Delhi Set-I

  • question_answer An element 'X' has mass number 35 and number of neutrons 18. Write atomic number and electronic configuration of 'X'. Also write group number, period number and valency of 'X'.

    Answer:

    Atomic no. of X = \[3518=17\]
                Electronic configuration = 2, 8, 7
                Group number = 17
                Period number = 3
                Valency = 1


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