Across
1
Center of an atom or cell
4
Unit of electric potential
7
Smallest unit of an element
9
Compound containing oxygen
10
Reddish electrical conductor
11
Natural satellite of Earth
12
Substance with pH above 7
Down
2
Icy body with a tail near the sun
3
Push or pull on an object
4
Hottest planet in solar system
5
Tissue that contracts for movement
6
Absolute temperature scale unit
8
Curved glass that refracts light