Across
1
Biological catalyst
4
Second lightest element
5
Solid with repeating atomic pattern
7
Disturbance that transfers energy
8
Nerve cell in the brain
Down
2
Unit of heredity
3
Center of an atom or cell
5
Reddish electrical conductor
6
Precious yellow metallic element
9
Substance with pH below 7
10
Element found in all living things
11
Glass that splits light into spectrum