Across
1
Biological catalyst
4
Compound containing oxygen
5
Solid with repeating atomic pattern
7
Naturally occurring inorganic solid
10
Reddish electrical conductor
11
Group of similar cells
Down
2
Second lightest element
3
Glass that splits light into spectrum
6
Hottest planet in solar system
8
Particle of light
9
Force that attracts objects together
12
Unit of power