Across
1
Unit of heredity
3
Unit of force
4
Solid with repeating atomic pattern
6
Gas form of a liquid
7
Tissue that contracts for movement
8
Mass per unit volume
11
Icy body with a tail near the sun
Down
2
Second lightest element
3
Center of an atom or cell
5
Particle of light
9
Smallest unit of an element
10
Unit of energy