Across
1
Solid with repeating atomic pattern
4
Fourth state of matter
5
Icy body with a tail near the sun
6
Chemical element in table salt
7
Precious yellow metallic element
12
Center of an atom or cell
13
Unit of force
Down
1
Element found in all living things
2
Group of similar cells
3
Measure of matter in an object
8
Curved glass that refracts light
9
Gas essential for breathing
10
Biological catalyst
11
Preserved remains of ancient life
14
Smallest unit of an element