Across
1
Reddish electrical conductor
4
Substance with pH above 7
5
Chemical element in table salt
6
Icy body with a tail near the sun
8
Second lightest element
9
Particle of light
13
Preserved remains of ancient life
Down
2
Compound containing oxygen
3
Push or pull on an object
7
Smallest unit of an element
9
Tectonic landmass section
10
Solid with repeating atomic pattern
11
Positive particle in nucleus
12
Natural satellite of Earth