diff --git a/Project.toml b/Project.toml
index bd42530..798667a 100644
--- a/Project.toml
+++ b/Project.toml
@@ -11,6 +11,7 @@ HTTP = "cd3eb016-35fb-5094-929b-558a96fad6f3"
 JSON = "682c06a0-de6a-54ab-a142-c8b1cf79cde6"
 PyFormattedStrings = "5f89f4a4-a228-4886-b223-c468a82ed5b9"
 Reexport = "189a3867-3050-52da-a836-e630ba90ab69"
+Revise = "295af30f-e4ad-537b-8983-00126c2a3abe"
 Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
 
 [compat]
diff --git a/src/constructors.jl b/src/constructors.jl
index 6a03b3b..ae87d44 100644
--- a/src/constructors.jl
+++ b/src/constructors.jl
@@ -96,7 +96,7 @@ If an anti-particle (subatomic or otherwise) prepend "anti-" to the name.
 Species
 
 
-Species() = Species("Null", 0.0u"e", 0.0u"MeV/c^2", 0.0u"h_bar", 0.0u"J/T", 0, Kind.Null)
+Species() = Species("Null", 0.0u"e", 0.0u"MeV/c^2", 0.0u"h_bar", 0.0u"J/T", 0, Kind.NULL)
 
 function Species(name::String, charge::Int=0, iso::Int=-1)
 
@@ -161,14 +161,17 @@ function Species(name::String, charge::Int=0, iso::Int=-1)
 			end
 		end
 		if count('+', name) != 0 && count('-', name) != 0
-			error(f"""You made a typo in "{name}". You have both a + and a - in the name. """)
+			error(f"""You made a typo in "{name}". You have both + and - in the name. """)
 			return
 		end
 		if haskey(ATOMIC_SPECIES, AS) # is the particle in the Atomic_Particles dictionary?
 			if iso ∉ keys(ATOMIC_SPECIES[AS].mass) # error handling if the isotope isn't available
-				error("The isotope you specified is not available: Isotopes are specified by the atomic symbol and integer mass number.")
+				error("""The isotope you specified is not available: Isotopes are specified by the atomic symbol and integer mass number.""")
 				return
 			end
+			if charge > ATOMIC_SPECIES[AS].Z
+				error(f"You have specified a larger positive charge than the fully stripped {ATOMIC_SPECIES[AS].species_name} atom has, which is unphysical.")
+			end
 			mass = begin
 				if anti_atom == false
 					nmass = uconvert(u"MeV/c^2", ATOMIC_SPECIES[AS].mass[iso]); 
diff --git a/src/particle_functions.jl b/src/particle_functions.jl
index cff266d..9bbbdee 100644
--- a/src/particle_functions.jl
+++ b/src/particle_functions.jl
@@ -91,22 +91,23 @@ function full_name(species::Species)
 		if species.iso > 0
 				isostring = "#" * f"{species.iso}"
 		end
-		if species.charge != 0
-			if species.charge == 1
+		if species.charge.val != 0
+			if species.charge.val == 1
 					chargestring = "+"
-			elseif species.charge == -1
-					chargestring == "-"
-			elseif species.charge == 2
+			elseif species.charge.val == -1
+					chargestring = "-"
+			elseif species.charge.val == 2
 					chargestring = "++"
-			elseif species.charge == -2
-					chargestring == "--"
-			elseif species.charge > 2
-					chargestring = f"+{species.charge}"
+			elseif species.charge.val == -2
+					chargestring = "--"
+			elseif species.charge.val > 2
+					chargestring = f"+{abs(species.charge.val)}"
 			elseif species.charge < -2
-					chargestring == f"-{species.charge}"
+					chargestring = f"-{abs(species.charge.val)}"
 			end
 		end
 		return isostring * species.name * chargestring
 	end
 end;
-export full_name
\ No newline at end of file
+export full_name
+ 
\ No newline at end of file