Across
1
Nerve cell in the brain
4
Unit of power
6
Preserved remains of ancient life
9
Smallest unit of an element
10
Particle of light
11
Chemical element in table salt
Down
1
Unit of force
2
Compound containing oxygen
3
Force that attracts objects together
5
Hottest planet in solar system
7
Glass that splits light into spectrum
8
Solid with repeating atomic pattern