1. Tardigrade
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  3. Chemistry
  4. Gd (64) gives an oxidation state of only +3 because:

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Q. $Gd (64)$ gives an oxidation state of only $+3$ because:

The d-and f-Block Elements

Solution:

In $+3$ oxidation state its configuration is $4 f ^{7}, 5 d ^{0}, 6 s ^{0}$ which is stable as per the rule of extra stability.