Across
1
Fourth state of matter
3
Precious yellow metallic element
5
Naturally occurring inorganic solid
7
Chemical element in table salt
8
Unit of heredity
9
Center of an atom or cell
11
Particle of light
12
Hottest planet in solar system
Down
2
Tissue that contracts for movement
3
Force that attracts objects together
4
Glass that splits light into spectrum
6
Absolute temperature scale unit
10
Compound containing oxygen