Across
1
Chemical element in table salt
2
Nerve cell in the brain
5
Amplified beam of light
6
Basic unit of life
8
Substance with pH below 7
10
Gas essential for breathing
Down
2
Center of an atom or cell
3
Unit of energy
4
Compound containing oxygen
7
Solid with repeating atomic pattern
9
Gas form of a liquid
11
Unit of force
12
Hottest planet in solar system
13
Substance with pH above 7