Across
1
Smallest unit of an element
4
Tectonic landmass section
5
Center of an atom or cell
6
Preserved remains of ancient life
9
Force that attracts objects together
10
Particle of light
11
Amplified beam of light
Down
2
Unit of power
3
Naturally occurring inorganic solid
7
Second lightest element
8
Path of a planet around the sun