Across
1
Fourth state of matter
4
Compound containing oxygen
6
Biological catalyst
9
Infectious microscopic agent
10
Group of similar cells
12
Unit of force
13
Positive particle in nucleus
Down
2
Smallest unit of an element
3
Reddish electrical conductor
5
Second lightest element
7
Element found in all living things
8
Form of thermal energy
11
Amplified beam of light
13
Glass that splits light into spectrum