Across
1
Magnetic metallic element
3
Substance with pH below 7
4
Center of an atom or cell
7
Ball of burning gas in space
11
Amplified beam of light
12
Unit of force
Down
2
Solid with repeating atomic pattern
5
Compound containing oxygen
6
Particle of light
8
Absolute temperature scale unit
9
Nerve cell in the brain
10
The Red Planet