Across
1
Icy body with a tail near the sun
2
Chemical element in table salt
4
Form of thermal energy
8
Push or pull on an object
9
Gas form of a liquid
10
Hottest planet in solar system
Down
2
Ball of burning gas in space
3
Smallest unit of an element
5
Precious yellow metallic element
6
Substance with pH above 7
7
Center of an atom or cell
11
Unit of force