Across
1
Magnetic metallic element
3
Particle of light
5
Nerve cell in the brain
9
Fourth state of matter
11
Icy body with a tail near the sun
Down
2
Gas essential for breathing
3
Positive particle in nucleus
4
Gas form of a liquid
6
Precious yellow metallic element
7
Natural satellite of Earth
8
Unit of heredity
9
Glass that splits light into spectrum
10
Substance with pH above 7