Across
1
Center of an atom or cell
3
Substance with pH below 7
4
Positive particle in nucleus
6
Natural satellite of Earth
9
Substance with pH above 7
10
Tissue that contracts for movement
Down
2
Group of similar cells
4
Glass that splits light into spectrum
5
Solid with repeating atomic pattern
7
Unit of power
8
Basic unit of life
11
Unit of heredity
12
Unit of electric potential