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An element ''X'' has mass number 35 and ...

An element ''X'' has mass number 35 and number of neutrons is 18. Identify group number and period of the element ''X''.

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Atomic number of the element 'X' = 35 - 18 = 17
Electronic configuration of the element 'X' = 2, 8, 7
Group number = 17, Period number = 3.
Valency of the element 'X' = 8 - 7 = 1.
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