Across
1
Smallest unit of an element
3
Mass per unit volume
6
Glass that splits light into spectrum
8
Unit of force
11
Element found in all living things
12
Basic unit of life
13
Magnetic metallic element
Down
2
Push or pull on an object
4
The Red Planet
5
Group of similar cells
7
Form of thermal energy
9
Chemical element in table salt
10
Compound containing oxygen