Across
1
Unit of force
5
Center of an atom or cell
6
Mass per unit volume
7
Precious yellow metallic element
10
Unit of power
11
Element found in all living things
12
Group of similar cells
Down
2
Gas essential for breathing
3
Particle of light
4
Magnetic metallic element
8
Substance with pH below 7
9
Reddish electrical conductor
13
Solid with repeating atomic pattern
14
Naturally occurring inorganic solid