Across
1
Solid with repeating atomic pattern
2
Hottest planet in solar system
4
Unit of force
9
Precious yellow metallic element
10
The Red Planet
12
Mass per unit volume
13
Particle of light
Down
2
Unit of electric potential
3
Path of a planet around the sun
5
Element found in all living things
6
Center of an atom or cell
7
Gas essential for breathing
8
Chemical element in table salt
11
Measure of matter in an object