Across
1
Fourth state of matter
5
Center of an atom or cell
6
Precious yellow metallic element
8
Chemical element in table salt
12
Nerve cell in the brain
Down
1
Positive particle in nucleus
2
Our home planet
3
Natural satellite of Earth
4
Molten rock beneath Earth surface
7
Element found in all living things
9
Curved glass that refracts light
10
Solid with repeating atomic pattern
11
Second lightest element