diff --git a/mlptrain/potentials/_base.py b/mlptrain/potentials/_base.py
index 6e97fe34..fa05177a 100644
--- a/mlptrain/potentials/_base.py
+++ b/mlptrain/potentials/_base.py
@@ -358,4 +358,5 @@ def copy(self) -> 'MLPotential':
     'Br': 2,
     'Kr': 1,
     'I': 2,
+    'Pd': 1,
 }