Across
1
Substance with pH below 7
2
Positive particle in nucleus
3
Measure of matter in an object
5
Ball of burning gas in space
6
Group of similar cells
8
Mass per unit volume
9
Element found in all living things
Down
1
Smallest unit of an element
2
Glass that splits light into spectrum
4
Unit of force
7
Substance with pH above 7
10
Hottest planet in solar system