Across
1
Unit of energy
3
Center of an atom or cell
4
Solid with repeating atomic pattern
7
Gas essential for breathing
10
Tectonic landmass section
Down
2
Blocking of light by a celestial body
5
Force that attracts objects together
6
Element found in all living things
8
Unit of power
9
Precious yellow metallic element
11
Reddish electrical conductor