Across
1
Glass that splits light into spectrum
3
Center of an atom or cell
5
Unit of energy
7
Fourth state of matter
9
Blocking of light by a celestial body
11
Magnetic metallic element
Down
2
Compound containing oxygen
4
Biological catalyst
6
Reddish electrical conductor
8
Gas essential for breathing
10
Measure of matter in an object
12
Form of thermal energy