diff --git a/Grade 10/Science/SNC2DZ/Unit 1: Chemistry.md b/Grade 10/Science/SNC2DZ/Unit 1: Chemistry.md
index a39f771..76846b1 100644
--- a/Grade 10/Science/SNC2DZ/Unit 1: Chemistry.md	
+++ b/Grade 10/Science/SNC2DZ/Unit 1: Chemistry.md	
@@ -1,3 +1,23 @@
 # Unit 1: Chemistry
 
-Matter- has mass, tkes up space.
+- Matter - has mass, takes up space.
+    - fundamental unit -> ATOMS
+
+## Atoms
+- Atoms are the smallest unit of an element that still retains its properties
+- Atoms are made of subatomic particles
+
+|Name|Symbol|Relative mass|Location|Relative Change|
+|:---|:-----|:------------|:-------|:--------------|
+|
+
+## IUPAC
+|Letter|Definition|
+|:-----|:---------|
+|I|International|
+|U|Union|
+|P|Pure and|
+|A|Applied|
+|C|Chemistry|
+
+- Involved in studying, varifying information (eg the periodic table -> Describes the elements -> pure susbtances made of only one kind of atom),and publishing.
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