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'.
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X' `rarr` Mass number = 35 No. of neutrons = 18 `therefore` Atomic number of X = Mass number - Number of neutrons = 35 - 18 = 17 K L M Thus, electronic configuration of X = 2, 8, 7 Group number = `17^(th)" ""Period number" = 3^(rd)" ""Valency" = 8 - 7 = 1`
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