Question
If $A$ is $[Rn]\,6d^2\,7s^2$ then identify block, period, group?
✓
Answer
d
$A = {}_{86}\left[ {Rn} \right]\,6{d^2}\,7{s^2}$
$A = {}_{86}\left[ {Rn} \right]\,6{d^2}\,7{s^2}$
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