Across
1
Element found in all living things
3
Fourth state of matter
4
Center of an atom or cell
7
Absolute temperature scale unit
8
Substance with pH below 7
9
Blocking of light by a celestial body
10
Push or pull on an object
Down
2
Force that attracts objects together
3
Particle of light
5
Unit of energy
6
Naturally occurring inorganic solid
8
Smallest unit of an element