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Write the Atomic Number of the Element Present in the Third Period and Seventeenth Group of the Periodic Table. - CBSE (Science) Class 11 - Chemistry

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Question

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

Solution 1

There are two elements in the 1st period and eight elements in the 2nd period., The third period starts with the element with = 11. Now, there are eight elements in the third period. Thus, the 3rd period ends with the element with Z = 18 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.

Solution 2

The element is chlorine (Cl) with atomic number (Z) = 17.

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APPEARS IN

 NCERT Solution for Chemistry Textbook for Class 11 (2018 to Current)
Chapter 3: Classification of Elements and Periodicity in Properties
Q: 5.2 | Page no. 93

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Solution Write the Atomic Number of the Element Present in the Third Period and Seventeenth Group of the Periodic Table. Concept: Electronic Configurations of Elements and Their Periodic Table.
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