Across
1
Center of an atom or cell
5
Particle of light
6
Smallest unit of an element
10
Push or pull on an object
11
Second lightest element
12
Fourth state of matter
13
Amplified beam of light
Down
2
Solid with repeating atomic pattern
3
Ball of burning gas in space
4
Unit of heredity
7
Blocking of light by a celestial body
8
Reddish electrical conductor
9
Precious yellow metallic element
10
Preserved remains of ancient life