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arvind kumar
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Asked: 2021-07-06T08:49:33+00:00 In:

Four elements P,Q,R and S belong to the third period of the Modern Periodic Table and have respectively 1, 3, 5 and 7 electrons in their outermost shells. Write the electronic configurations of Q and R and determine their valencies. Write the molecular formula of the compound formed when P and S combine.

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      Elements P,Q R and S are the elements of third period, these must have three filled shells.
      Electronic configuration of R: 2,8,5
      Valency of R: 8-5 = 3
      Electronic configuration of P: 2,8,1
      Electronic configuration of S: 2,8,7
      :Formula of the compound formed by the combination of P and S: PS/NaCI.

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