Across
1
Group of similar cells
5
Solid with repeating atomic pattern
7
Blocking of light by a celestial body
8
Positive particle in nucleus
Down
2
Measure of matter in an object
3
Particle of light
4
Chemical element in table salt
6
Disturbance that transfers energy
9
Icy body with a tail near the sun
10
Unit of power
11
Path of a planet around the sun
12
Magnetic metallic element
13
Reddish electrical conductor