Merge pull request #26 from madsfaerch/master

Remove uncertainty from Np and Ac

PeriodicTableJSON.json

@@ -373,7 +373,7 @@
             "boil": null, 
             "category": "polyatomic nonmetal", 
             "color": null, 
-            "density": null, 
+            "density": 1.823, 
             "discovered_by": "Hennig Brand", 
             "melt": null, 
             "molar_heat": 23.824, 
@@ -2525,7 +2525,7 @@
             "name": "Actinium", 
             "appearance": null, 
             "atomic_mass": 227, 
-            "boil": 3500300, 
+            "boil": 3500, 
             "category": "actinide", 
             "color": null, 
             "density": 10, 
@@ -2654,7 +2654,7 @@
             "color": null, 
             "density": 20.45, 
             "discovered_by": "Edwin McMillan", 
-            "melt": 9123, 
+            "melt": 912, 
             "molar_heat": 29.46, 
             "named_by": null, 
             "number": 93,