Across
1
Chemical element in table salt
3
Gas form of a liquid
4
Icy body with a tail near the sun
7
Measure of matter in an object
10
Smallest unit of an element
11
Push or pull on an object
Down
2
Curved glass that refracts light
3
Hottest planet in solar system
5
Mass per unit volume
6
Compound containing oxygen
8
Infectious microscopic agent
9
Fourth state of matter