Across
1
Positive particle in nucleus
5
Precious yellow metallic element
6
Push or pull on an object
7
Solid with repeating atomic pattern
8
Hottest planet in solar system
11
Biological catalyst
13
Nerve cell in the brain
Down
2
Gas essential for breathing
3
Center of an atom or cell
4
Icy body with a tail near the sun
9
Curved glass that refracts light
10
Element found in all living things
12
Reddish electrical conductor