Across
1
Second lightest element
5
Substance with pH above 7
6
Unit of heredity
7
Gas form of a liquid
9
Substance with pH below 7
10
Reddish electrical conductor
11
Unit of energy
Down
2
Magnetic metallic element
3
Smallest unit of an element
4
Nerve cell in the brain
6
Precious yellow metallic element
8
Tectonic landmass section
12
Our home planet