Across
1
Unit of energy
3
Positive particle in nucleus
7
Preserved remains of ancient life
8
Form of thermal energy
9
Center of an atom or cell
Down
2
Unit of electric potential
4
Solid with repeating atomic pattern
5
Force that attracts objects together
6
Path of a planet around the sun
10
Icy body with a tail near the sun
11
Reddish electrical conductor