Across
1
Smallest unit of an element
3
Mass per unit volume
6
Infectious microscopic agent
7
Gas form of a liquid
10
Tissue that contracts for movement
12
Curved glass that refracts light
Down
2
Push or pull on an object
4
Naturally occurring inorganic solid
5
Absolute temperature scale unit
8
Nerve cell in the brain
9
Reddish electrical conductor
11
Second lightest element