Across
1
Precious yellow metallic element
3
Particle of light
4
Blocking of light by a celestial body
5
Icy body with a tail near the sun
8
Ball of burning gas in space
9
Positive particle in nucleus
Down
2
Unit of force
3
Tectonic landmass section
5
Solid with repeating atomic pattern
6
Measure of matter in an object
7
Our home planet
10
Element found in all living things
11
Center of an atom or cell