Across
1
Solid with repeating atomic pattern
4
Form of thermal energy
5
Nerve cell in the brain
6
Substance with pH below 7
8
Unit of power
9
Fourth state of matter
10
Natural satellite of Earth
Down
2
Push or pull on an object
3
Center of an atom or cell
4
Second lightest element
7
Amplified beam of light
11
The Red Planet
12
Precious yellow metallic element