Across
1
Center of an atom or cell
5
Unit of force
6
Compound containing oxygen
11
Disturbance that transfers energy
13
Particle of light
Down
2
Curved glass that refracts light
3
Unit of electric potential
4
Unit of energy
7
Unit of power
8
Push or pull on an object
9
Group of similar cells
10
Magnetic metallic element
12
Gas form of a liquid