diff --git a/src/heurams/kernel/particles/atom.py b/src/heurams/kernel/particles/atom.py
index 0e3d0f6..5483f6a 100644
--- a/src/heurams/kernel/particles/atom.py
+++ b/src/heurams/kernel/particles/atom.py
@@ -52,4 +52,4 @@ class Atom():
 
     @staticmethod
     def placeholder():
-        return (Electron.placeholder(), Nucleon.placeholder(), {})
+        return (Electron.placeholder(), Nucleon.placeholder(), {})
\ No newline at end of file
diff --git a/src/heurams/kernel/particles/loader.py b/src/heurams/kernel/particles/loader.py
index 14efd4f..42aba06 100644
--- a/src/heurams/kernel/particles/loader.py
+++ b/src/heurams/kernel/particles/loader.py
@@ -5,7 +5,7 @@ import pathlib
 import toml
 import json
 
-def loader_nucleon(path: pathlib.Path, fmt = "toml"):
+def load_nucleon(path: pathlib.Path, fmt = "toml"):
     with open(path, "r") as f:
         dictdata = dict()
         toml.load(f, dictdata) # type: ignore
@@ -13,4 +13,14 @@ def loader_nucleon(path: pathlib.Path, fmt = "toml"):
         for item, attr in dictdata.items():
             if item == "__metadata__":
                 continue
-            lst.append(Nucleon(hasher.hash(item), attr))
+            lst.append((Nucleon(hasher.hash(item), attr), dictdata["__metadata__"]["orbital"]))
+        return lst
+
+def load_electron(path: pathlib.Path, fmt = "json"):
+    with open(path, "r") as f:
+        dictdata = dict()
+        json.load(f, dictdata) # type: ignore
+        lst = list()
+        for item, attr in dictdata.items():
+            lst.append(Electron(hasher.hash(item), attr))
+        return lst
\ No newline at end of file
diff --git a/src/heurams/kernel/particles/nucleon.py b/src/heurams/kernel/particles/nucleon.py
index a8d3591..f6e7f73 100644
--- a/src/heurams/kernel/particles/nucleon.py
+++ b/src/heurams/kernel/particles/nucleon.py
@@ -1,29 +1,29 @@
 class Nucleon:
     """原子核: 材料元数据"""
 
-    def __init__(self, ident: str, metadata: dict):
+    def __init__(self, ident: str, payload: dict):
         """初始化原子核 (记忆内容)
 
         Args:
             ident: 唯一标识符
-            metadata: 记忆内容信息
+            payload: 记忆内容信息
         """
-        self.metadata = metadata
+        self.payload = payload
         self.ident = ident
 
     def __getitem__(self, key):
         if key == "ident":
             return self.ident
-        if key in self.metadata:
-            return self.metadata[key]
+        if key in self.payload:
+            return self.payload[key]
         else:
-            raise KeyError(f"Key '{key}' not found in metadata.")
+            raise KeyError(f"Key '{key}' not found in payload.")
 
     def __iter__(self):
-        yield from self.metadata.keys()
+        yield from self.payload.keys()
 
     def __len__(self):
-        return len(self.metadata)
+        return len(self.payload)
 
     def __hash__(self):
         return hash(self.ident)