Across
1
Chemical element in table salt
4
Substance with pH above 7
6
Hottest planet in solar system
11
Nerve cell in the brain
Down
2
Curved glass that refracts light
3
Biological catalyst
5
Measure of matter in an object
7
Particle of light
8
Ball of burning gas in space
9
Glass that splits light into spectrum
10
Path of a planet around the sun