Across
1
Our home planet
2
Element found in all living things
3
Positive particle in nucleus
4
Hottest planet in solar system
6
Smallest unit of an element
7
Preserved remains of ancient life
9
Nerve cell in the brain
10
Glass that splits light into spectrum
Down
2
Solid with repeating atomic pattern
3
Particle of light
4
Infectious microscopic agent
5
Group of similar cells
8
Unit of heredity