An element “X” has mass number 35 and the number of neutrons, is 18. Identify
the group number and period of “X”.
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chlorine is the element
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atomic no=mass number-no of neutrons
=35-18
=17
therefore atomic no.=17
element=chlorine
therefore group no =17th group and 3rd period
=35-18
=17
therefore atomic no.=17
element=chlorine
therefore group no =17th group and 3rd period
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