A quick video explaining how to model atoms and molecules in Blender.
Download blender here (any version greater than 2.8 should be fine):
https://www.blender.org/
0:00 - Intro
0:34 - Adding atoms and bonds
1:25 - Moving atoms and bonds
2:00 - Rotating bonds around atoms
3:12 - Expanding a structure
4:00 - Adding Hydrogen Atoms
4:56 - Adding colors to atoms (Materials)
6:27 - Changing views
6:50 - Multiple bonds
7:20 - Rotating the entire molecule
