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Write the atomic number of the element i...

Write the atomic number of the element in the third period and group 17 of the period table.

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In the third period third shell is filled and there are 8 elements (3s 3p). These will be two Ar(18). So element 11 and 12 are s block while 13 to 18 are p block belonging to groups 13 to 18. So the elment in the `17^th` group must have an atomic number 17 (Chlorine).
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A N EXCEL PUBLICATION-CLASSIFICATION TO ELEMENTS AND PERIODICITY IN PROPERTIES-QUESTION BANK
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