Across
1
Precious yellow metallic element
3
Particle of light
6
Disturbance that transfers energy
8
Solid with repeating atomic pattern
9
Nerve cell in the brain
10
Hottest planet in solar system
11
Curved glass that refracts light
Down
2
Unit of electric potential
4
Gas essential for breathing
5
Blocking of light by a celestial body
7
Unit of force
8
Element found in all living things