SELECT * FROM question_mgmt as q WHERE id=191 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=44 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

Write the atomic number of the element present in the third period and seventeenth group of the periodic table.

Answer:

There are two elements in the 1st period and eight elements in the 2nd period., The third period starts with the element with Z = 11(sodium). Now, there are nine  elements in the third period. Thus, the 3rd period ends with the element with Z = 18(argon) i.e., the element in the 18th group of the third period has Z = 18. Hence, the element in the 17th group of the third period has atomic number Z = 17 ,chlorine(Cl) with atomic mass 35.453, which is a p block element.


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