Across
1
Particle of light
2
Reddish electrical conductor
4
Infectious microscopic agent
5
Force that attracts objects together
6
Amplified beam of light
8
Basic unit of life
9
Positive particle in nucleus
10
Second lightest element
Down
1
Fourth state of matter
2
Element found in all living things
3
Magnetic metallic element
7
Group of similar cells
9
Glass that splits light into spectrum
11
Unit of power