Add is_radioactive property to Element class

pymatgen/core/composition.py

@@ -508,7 +508,7 @@ def contains_element_type(self, category: str) -> bool:
             category (str): one of "noble_gas", "transition_metal",
                 "post_transition_metal", "rare_earth_metal", "metal", "metalloid",
                 "alkali", "alkaline", "halogen", "chalcogen", "lanthanoid",
-                "actinoid", "quadrupolar", "s-block", "p-block", "d-block", "f-block"
+                "actinoid", "radioactive", "quadrupolar", "s-block", "p-block", "d-block", "f-block"
 
         Returns:
             bool: True if any elements in Composition match category, otherwise False

pymatgen/core/periodic_table.py

@@ -738,6 +738,11 @@ def is_actinoid(self) -> bool:
         """True if element is a actinoid."""
         return 88 < self.Z < 104
 
+    @property
+    def is_radioactive(self) -> bool:
+        """True if element is a radioactive element."""
+        return self.Z in (43, 61) or self.Z > 83
+
     @property
     def is_quadrupolar(self) -> bool:
         """Check if this element can be quadrupolar."""
@@ -1512,6 +1517,7 @@ class ElementType(Enum):
     chalcogen = "chalcogen"  # O, S, Se, Te, Po
     lanthanoid = "lanthanoid"  # La-Lu
     actinoid = "actinoid"  # Ac-Lr
+    radioactive = "radioactive"  # Tc, Pm, Po-Lr
     quadrupolar = "quadrupolar"
     s_block = "s-block"
     p_block = "p-block"

tests/core/test_periodic_table.py

@@ -237,6 +237,7 @@ def test_attributes(self):
             ("U", "Pu"): "is_actinoid",
             ("Si", "Ge"): "is_metalloid",
             ("O", "Te"): "is_chalcogen",
+            ("Tc", "Po"): "is_radioactive",
         }
 
         for key, val in is_true.items():
@@ -607,4 +608,4 @@ def test_get_el_sp():
 def test_element_type():
     assert isinstance(ElementType.actinoid, Enum)
     assert isinstance(ElementType.metalloid, Enum)
-    assert len(ElementType) == 17
+    assert len(ElementType) == 18