Across
1
Chemical element in table salt
4
Solid with repeating atomic pattern
6
Positive particle in nucleus
7
Basic unit of life
9
Our home planet
11
Measure of matter in an object
12
Smallest unit of an element
13
Nerve cell in the brain
Down
2
Absolute temperature scale unit
3
Curved glass that refracts light
5
Unit of electric potential
6
Tectonic landmass section
8
Mass per unit volume
10
Natural satellite of Earth