Across
1
Substance with pH above 7
4
Center of an atom or cell
6
Element found in all living things
7
Fourth state of matter
8
Positive particle in nucleus
10
Group of similar cells
11
Smallest unit of an element
Down
2
Path of a planet around the sun
3
Reddish electrical conductor
5
Push or pull on an object
9
Disturbance that transfers energy