Across
1
Fourth state of matter
4
Glass that splits light into spectrum
6
Ball of burning gas in space
7
Push or pull on an object
8
Amplified beam of light
10
Measure of matter in an object
11
Particle of light
12
Center of an atom or cell
Down
2
Second lightest element
3
Naturally occurring inorganic solid
5
Group of similar cells
8
Curved glass that refracts light
9
Unit of electric potential
13
Form of thermal energy