Across
1
Smallest unit of an element
4
Hottest planet in solar system
6
Unit of power
7
Curved glass that refracts light
9
Particle of light
Down
2
Measure of matter in an object
3
Magnetic metallic element
4
Unit of electric potential
5
Tissue that contracts for movement
8
Preserved remains of ancient life
9
Fourth state of matter
10
Nerve cell in the brain