diff --git a/.obsidian/graph.json b/.obsidian/graph.json
index a773819..1afee3f 100644
--- a/.obsidian/graph.json
+++ b/.obsidian/graph.json
@@ -17,6 +17,6 @@
   "repelStrength": 10,
   "linkStrength": 1,
   "linkDistance": 250,
-  "scale": 0.4989651034462171,
-  "close": false
+  "scale": 0.5297823419980713,
+  "close": true
 }
\ No newline at end of file
diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index 9552cb2..2446c65 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -83,12 +83,26 @@
             "state": {
               "type": "markdown",
               "state": {
-                "file": "chemistry/Stoichiometry.md",
+                "file": "root.md",
                 "mode": "source",
                 "source": false
               },
               "icon": "lucide-file",
-              "title": "Stoichiometry"
+              "title": "root"
+            }
+          },
+          {
+            "id": "03c6a2c194cc7912",
+            "type": "leaf",
+            "state": {
+              "type": "markdown",
+              "state": {
+                "file": "polyatomic ions.md",
+                "mode": "source",
+                "source": false
+              },
+              "icon": "lucide-file",
+              "title": "polyatomic ions"
             }
           },
           {
@@ -120,7 +134,7 @@
             }
           }
         ],
-        "currentTab": 5
+        "currentTab": 6
       },
       {
         "id": "25da4f0a48a8e7cd",
@@ -299,8 +313,11 @@
       "obsidian-excalidraw-plugin:New drawing": false
     }
   },
-  "active": "795f41c179837d1c",
+  "active": "2a2c61d4f4ddce12",
   "lastOpenFiles": [
+    "polyatomic ions.md",
+    "root.md",
+    "chemistry/Stoichiometry.md",
     "biology/cell biology.md",
     "chemistry/solubility table.md",
     "chemistry/state of matter.md",
@@ -325,9 +342,6 @@
     "physics/kinesmatics formulas.md",
     "math/quadratics.md",
     "chemistry/chemistry.md",
-    "chemistry/Matter and Chemical Bonding.md",
-    "chemistry/electronegativity.md",
-    "chemistry/polar molecules.md",
     "Pasted image 20260716183501.png",
     "Recording 20260716183349.m4a",
     "Recording 20260716183320.m4a",
diff --git a/chemistry/Stoichiometry.md b/chemistry/Stoichiometry.md
index 402af22..b9d93c6 100644
--- a/chemistry/Stoichiometry.md
+++ b/chemistry/Stoichiometry.md
@@ -2,4 +2,6 @@
 
 **"calculation of relative quantities of reactants and products in chemical reactions"**
 
-
+n=mole=conversion factor=$6.02*10^{23}$ things (atoms/ions/molecules/formulaunits/etc)
+1 pair = 2  things
+1 dozen = 12 things
diff --git a/polyatomic ions.md b/polyatomic ions.md
new file mode 100644
index 0000000..cb3aa6a
--- /dev/null
+++ b/polyatomic ions.md	
@@ -0,0 +1,141 @@
+[[chemistry]]
+
+**"a charged chemical species composed of two or more atoms covalently bonded or of a metal complex, that can be considered to be acting as a single unit"
+
+|**Name**|**Formula**|
+|---|---|
+|**Polyatomic ions (carrying negative charge)**|   |
+|---|---|
+|Hydroxide|OH–|
+|---|---|
+|Acetate|CH3COO–|
+|---|---|
+|Cyanide|CN–|
+|---|---|
+|Chlorate|ClO3–|
+|---|---|
+|Chlorite|ClO2–|
+|---|---|
+|Nitrate|NO3–|
+|---|---|
+|Nitrite|NO2–|
+|---|---|
+|Hypochlorite|OCl–|
+|---|---|
+|Hypobromite|OBr –|
+|---|---|
+|Iodate|IO3–|
+|---|---|
+|Bisulphite|HSO3–|
+|---|---|
+|Bisulphate|HSO4–|
+|---|---|
+|Permanganate|MnO4–|
+|---|---|
+|Thiocyanate|SCN–|
+|---|---|
+|Hydrogen carbonate|HCO3–|
+|---|---|
+|Carbonate|CO32-|
+|---|---|
+|Sulphate|SO42-|
+|---|---|
+|Sulphite|SO32-|
+|---|---|
+|Oxalate|C2O42-|
+|---|---|
+|Silicate|SiO32-|
+|---|---|
+|Manganate|MnO42-|
+|---|---|
+|Thiosulphate|S2O32-|
+|---|---|
+|Chromate|CrO42-|
+|---|---|
+|Dichromate|Cr2O72-|
+|---|---|
+|Phosphate|PO43-|
+|---|---|
+|Phosphite|PO33-|
+|---|---|
+|Aluminate|AlO33-|
+|---|---|
+|Arsenite|AsO33-|
+|---|---|
+|Arsenate|AsO43-|
+|---|---|
+|Borate|BO33-|
+|---|---|
+|Pyrophosphate|P2O74-|
+|---|---|
+|**Polyatomic ions (carrying positive charge)**|   |
+|---|---|
+|Ammonium|NH4+|
+|---|---|
+
+## List of monatomic ions
+
+- The ions made of a single atom are called **simple ions or monatomic ions**.
+
+|**Name**|**Formula**|
+|---|---|
+|**Monatomic ions (carrying positive charge)**|   |
+|---|---|
+|Hydrogen|H+|
+|---|---|
+|Potassium|K+|
+|---|---|
+|Sodium|Na+|
+|---|---|
+|Silver|Ag+|
+|---|---|
+|Cuprous|Cu+|
+|---|---|
+|Aurous|Au+|
+|---|---|
+|Barium|Ba2+|
+|---|---|
+|Calcium|Ca2+|
+|---|---|
+|Magnesium|Mg2+|
+|---|---|
+|Cupric|Cu2+|
+|---|---|
+|Ferrous|Fe2+|
+|---|---|
+|Stannous|Sn2+|
+|---|---|
+|Mercuric|Hg2+|
+|---|---|
+|Zinc|Zn2+|
+|---|---|
+|Plumbous|Pb2+|
+|---|---|
+|Aluminum|Al3+|
+|---|---|
+|Ferric|Fe3+|
+|---|---|
+|Auric|Au3+|
+|---|---|
+|Arseneous|As3+|
+|---|---|
+|Plumbic|Pb4+|
+|---|---|
+|Stannic|Sn4+|
+|---|---|
+|**Monatomic ions (carrying negative charge)**|   |
+|---|---|
+|Chloride|Cl–|
+|---|---|
+|Bromide|Br –|
+|---|---|
+|Iodide|I–|
+|---|---|
+|Oxide|O2-|
+|---|---|
+|Sulphide|S2-|
+|---|---|
+|Nitride|N3-|
+|---|---|
+|Phosphide|P3-|
+|---|---|
\ No newline at end of file
diff --git a/root.md b/root.md
index e69de29..4610499 100644
--- a/root.md
+++ b/root.md
@@ -0,0 +1 @@
+# the big **R**