Across
1
Nerve cell in the brain
3
Smallest unit of an element
5
Fourth state of matter
6
Amplified beam of light
9
Second lightest element
10
Glass that splits light into spectrum
Down
2
Path of a planet around the sun
3
Substance with pH below 7
4
Substance with pH above 7
6
Curved glass that refracts light
7
Hottest planet in solar system
8
Basic unit of life
11
Measure of matter in an object