Across
1
Solid with repeating atomic pattern
4
Reddish electrical conductor
5
Group of similar cells
7
Path of a planet around the sun
9
Blocking of light by a celestial body
11
Disturbance that transfers energy
Down
2
Particle of light
3
Force that attracts objects together
6
Second lightest element
8
Nerve cell in the brain
10
Substance with pH above 7