Across
1
Curved glass that refracts light
4
Unit of force
6
Center of an atom or cell
9
Magnetic metallic element
10
Chemical element in table salt
Down
2
Unit of electric potential
3
Group of similar cells
4
Nerve cell in the brain
5
Push or pull on an object
7
Fourth state of matter
8
Second lightest element
11
Precious yellow metallic element