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- #Chemistry Part I Textbook for Class XI
- #Chemistry
- #Classification of Elements and Periodicity in Properties
- #NCERT
- #CBSE 11 Class
3.6 Write the atomic number of the element present in the third period and seventeenth group of the periodic table.
Answers (1)
Given that it is present in the 3rd period and a 17th group of the periodic table.
So, the first period has 2 elements and the second period has 8 elements. The 3rd period starts with the element with Z=11. And there are 8 elements present in the third period. Thus, the 3rd period ends with the element with Z=18. The element in the 18th group of the 3rd period has Z=18. Hence, the element in the 17th group of the 3rd period has atomic number Z=17.
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