Across
1
Curved glass that refracts light
3
Smallest unit of an element
5
Compound containing oxygen
6
Unit of electric potential
7
Nerve cell in the brain
10
Unit of power
Down
2
Reddish electrical conductor
4
Preserved remains of ancient life
7
Center of an atom or cell
8
Path of a planet around the sun
9
Tectonic landmass section
11
Measure of matter in an object
12
Precious yellow metallic element