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GSTRU and P belong to the same period in the periodic table. The ions formed by the atoms are as below:-
Q2+, U-, T2-, R3+, P+, S3-

  1. Arrange the elements in order of decreasing atomic size.
  2. Suggest a reason why elements P and Q cannot react with each to form a compound.

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  1. Arrange the elements in order of decreasing atomic size.
    U ,T ,S ,R ,Q ,P 
                  →
    Decreasing atomic size
  2. Suggest a reason why elements P and Q cannot react with each to form a compound.
    • Both P and Q need to loose electrons to become stable, therefore they cannot react to form a compound.
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