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

An element X has mass number 35 and number of neutrons = 18. Write atomic number and electronic configuration of X. Also write group number, period number and valency of X.

Text Solution

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Atomic number = mass number - number of neutrons `= 35 - 18 = 17. `
Electronic configuration of `X: 2, 8, 7`
  Group number = 17, period number = 3, valency = 8 - 7 = 1
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