Add Pd singlet multiplicity

[juraskov]

Add singlet Pd to a list of elements

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.95%. Comparing base (8e58b3c) to head (b6a8ee6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #119   +/-   ##
=======================================
  Coverage   61.95%   61.95%           
=======================================
  Files          37       37           
  Lines        4235     4235           
=======================================
  Hits         2624     2624           
  Misses       1611     1611           

Flag	Coverage Δ
python-3.9	57.96% <ø> (ø)
python-3.9-ace	57.96% <ø> (ø)
python-3.9-mace	61.77% <ø> (ø)

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