Across
1
Compound containing oxygen
3
Element found in all living things
6
Chemical element in table salt
9
Unit of heredity
10
Unit of energy
12
Particle of light
Down
2
Positive particle in nucleus
3
Solid with repeating atomic pattern
4
Absolute temperature scale unit
5
Amplified beam of light
7
Biological catalyst
8
The Red Planet
11
Group of similar cells