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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Element is chlorine and group no is 17 and period is 3
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Atomic number of x=mass number of x-number of neutrons
=35-18=17
Electronic configuration =2,8,7
Group number =valence electrons +10=17
Period = number of shells =3
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