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Added explanation:

In the outer orbitals of Pt (Period VI, 5d-blocktransition elements, after the 4f-block-lanthanides) there are two unpaired electrons:

  1. the first is the odd one in 4f17 (or maybe by exchange with 5d10>9)
  2. and the other one is the odd one in 6s1
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14y ago

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