Across
1
Compound containing oxygen
4
Solid with repeating atomic pattern
7
Biological catalyst
9
Chemical element in table salt
12
Unit of energy
Down
2
Precious yellow metallic element
3
Absolute temperature scale unit
4
Reddish electrical conductor
5
Center of an atom or cell
6
Ball of burning gas in space
8
Group of similar cells
10
Tectonic landmass section
11
Preserved remains of ancient life