diff --git a/Grade 10/Science/SNC2DZ/Unit 1: Chemistry.md b/Grade 10/Science/SNC2DZ/Unit 1: Chemistry.md
index bc31fee..1fb20d3 100644
--- a/Grade 10/Science/SNC2DZ/Unit 1: Chemistry.md	
+++ b/Grade 10/Science/SNC2DZ/Unit 1: Chemistry.md	
@@ -2,6 +2,7 @@
 
 - Matter - has mass, takes up space.
     - fundamental unit -> ATOMS
+- One `formula unit` - repeating strucure in an ionic compound taht has the simplest ratio of ions in the compound
 
 ## Atoms
 - Atoms are the smallest unit of an element that still retains its properties
@@ -51,7 +52,9 @@
 - They tend to lose electrons
 - They are shiny, ductile, malleable, conductive
 - They have a weak/loose hold on electrons
-
+- Most metals are considered to be multi-metals
+    - can form ions of differing charges 
+    - add roman numerals to the ions name to indicate its charge, for example, iron($`III`$) oxide.
 ## Non-Metals
 - They are dull, bad conductors - insulators
 - Tend to gain electrons
@@ -79,3 +82,14 @@
 |Bromide|Telluride|
 |Iodide|Astitide|
 
+## Chemical Nomenclature
+- Naming and writing chemical formuals
+- According to IUPAC
+- Direct relationship beween chemical name and chemical structure
+
+|Formula|Name|
+|:------|:---|
+|$`NaCl`$|Sodium chloride|
+|$`K_3P`$|Potassium phosphide|
+|$`Mg_3P_2`$|Magnesium phosphide|
+