Across
1
Compound containing oxygen
4
Naturally occurring inorganic solid
5
Solid with repeating atomic pattern
6
Nerve cell in the brain
8
Ball of burning gas in space
Down
1
Path of a planet around the sun
2
Unit of heredity
3
Substance with pH below 7
7
Center of an atom or cell
9
Reddish electrical conductor
10
Fourth state of matter
11
Element found in all living things