Across
1
Nerve cell in the brain
5
Center of an atom or cell
8
Measure of matter in an object
9
Element found in all living things
10
Naturally occurring inorganic solid
11
Smallest unit of an element
Down
2
Amplified beam of light
3
Magnetic metallic element
4
Positive particle in nucleus
6
Mass per unit volume
7
Substance with pH above 7
8
Tissue that contracts for movement