Across
1
Nerve cell in the brain
3
Glass that splits light into spectrum
7
Group of similar cells
8
Unit of power
9
Precious yellow metallic element
10
Reddish electrical conductor
11
Element found in all living things
Down
2
Path of a planet around the sun
3
Positive particle in nucleus
4
Naturally occurring inorganic solid
5
Magnetic metallic element
6
Particle of light