SELECT * FROM question_mgmt as q WHERE id=3621 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=9 AND subId=16 AND chapterId=256 and ex_no='4' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 10th science Periodic Classification of Element an atom has electronic configuration 2 8 7

Question:

An atom has electronic configuration 2, 8, 7.

   (a)  What is the atomic number of this element?
   (b)  To which of the following elements would it be chemically similar? (Atomic numbers are given in parentheses.)
          N(7)      F(9)      P(15)      Ar(18)

Answer:

(a) The atomic number of this element is 17.

(b) It would be chemically similar to F(9) with configuration as 2, 7.


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