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Q.

The maximum valency (=8) is shown by

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a

Xe, Os

b

Xe, Ru

c

Xe,Os,Ru

d

Xe,Os, Ru, Mn

answer is C.

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Detailed Solution

detailed_solution_thumbnail
  • Mn has seven valence electrons, hence it can go to maximum valency=7.
  • There are 2 electrons in the last shell of Os and six electrons in the d-orbital, so it can show valency = 8.
  • Ru is Ruthenium and it is a transition metal whose electronic configuration is [Kr] 4d7 5s1, so it can show valency = 8.
  • Being a member of group-18, Xe can show valency = 8.
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