Across
1
Measure of matter in an object
4
Reddish electrical conductor
6
Disturbance that transfers energy
8
Unit of power
9
Smallest unit of an element
12
Hottest planet in solar system
Down
2
Amplified beam of light
3
Fourth state of matter
5
Unit of energy
7
Force that attracts objects together
10
Second lightest element
11
Biological catalyst