An element x has mass number 35 and the number of neutrons, is 18. Identify the group number and period of x.C
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The period of the element is 3, i.e it belongs to the third period.
The element belongs to group 17 , i.e the halogens.
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Atomic number of X = Mass number of X – No. of neutrons
Atomic number of X = 35 - 18 = 17
Electronic configuration = 2, 8, 7
Group number = 17
Period Number = 3
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