diff --git a/Grade 10/Science/SNC2DZ/Unit 1: Chemistry.md b/Grade 10/Science/SNC2DZ/Unit 1: Chemistry.md
index 387e42f..4d99781 100644
--- a/Grade 10/Science/SNC2DZ/Unit 1: Chemistry.md	
+++ b/Grade 10/Science/SNC2DZ/Unit 1: Chemistry.md	
@@ -207,3 +207,6 @@ we don't put a mono due to no ambigious cases.
 |$`OH^-`$|<img src="https://upload.wikimedia.org/wikipedia/commons/thumb/b/b0/Hydroxide_lone_pairs-2D.svg/1200px-Hydroxide_lone_pairs-2D.svg.png" width="100">|<img src="http://www.chem.ucla.edu/~harding/IGOC/H/hydroxide_ion02.png" width="100">|Hydroxide ion|
 |$`H_3O^+`$|<img src="http://davidjohnewart.com/Chemistry/chemtheft/text_images/FG17_01_01UN.JPG" width="100">|<img src="https://manditaylorjebe.files.wordpress.com/2011/09/h3o_1.jpg" width="100">|Hydrodium ion|
 
+|Dots representing shared pairs of elections|Lines representing shared pairs of electrons|
+|:-----------------------------------------:|:------------------------------------------:|
+|<img src="https://us-static.z-dn.net/files/dda/2c1dcdc1c2156ae7d470b0daf0729abf.png" width="200">|<img src="https://www.thoughtco.com/thmb/R3AABuXGUgGOT3F7daTcl1tPFz0=/735x0/formaldehyde_LD-56a12a2c3df78cf772680353.png" width="200">|
\ No newline at end of file