Across
1
Precious yellow metallic element
2
Glass that splits light into spectrum
3
Unit of force
6
Nerve cell in the brain
7
Positive particle in nucleus
9
Unit of heredity
10
Hottest planet in solar system
12
Element found in all living things
Down
2
Particle of light
3
Center of an atom or cell
4
The Red Planet
5
Push or pull on an object
8
Compound containing oxygen
11
Curved glass that refracts light