Across
1
Natural satellite of Earth
2
Particle of light
4
Substance with pH above 7
5
Solid with repeating atomic pattern
6
Center of an atom or cell
Down
2
Glass that splits light into spectrum
3
Biological catalyst
7
Substance with pH below 7
8
Unit of electric potential
9
Form of thermal energy
10
Compound containing oxygen
11
Second lightest element