Across
1
Reddish electrical conductor
5
Solid with repeating atomic pattern
7
Measure of matter in an object
9
Blocking of light by a celestial body
11
Compound containing oxygen
Down
2
Unit of heredity
3
Fourth state of matter
4
Center of an atom or cell
6
Mass per unit volume
8
Positive particle in nucleus
10
Ball of burning gas in space