Across
1
Glass that splits light into spectrum
4
Molten rock beneath Earth surface
5
Positive particle in nucleus
7
Mass per unit volume
9
Precious yellow metallic element
10
Gas essential for breathing
Down
2
Smallest unit of an element
3
Nerve cell in the brain
5
Particle of light
6
Solid with repeating atomic pattern
8
Amplified beam of light
11
Chemical element in table salt