13 what is the atomic number of element of
period. 3 and group 17 of the periodic Table?
b) u
y 17
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the element is chlorine.
it belongs to group 17 as it has 7 valence electrons ( 10+7 ).
it belongs to period 3 because 3 shells are filled ( 2,8,7 ).
Therefore, the required atomic number is 17.
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