Across
1
Magnetic metallic element
4
The Red Planet
5
Icy body with a tail near the sun
7
Second lightest element
8
Unit of force
9
Group of similar cells
10
Molten rock beneath Earth surface
11
Substance with pH below 7
Down
2
Compound containing oxygen
3
Biological catalyst
6
Chemical element in table salt
11
Smallest unit of an element