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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 X = Mass No. - No. of neutrons = 35 - 17 = 18. Electronic configuration = 2, 8, 7, Group No. = 17, Period No. = 3.
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DINESH PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-Very Short Answer Questions
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