Across
1
Solid with repeating atomic pattern
4
Reddish electrical conductor
5
Substance with pH below 7
6
Unit of energy
7
Center of an atom or cell
10
Compound containing oxygen
11
Path of a planet around the sun
12
Second lightest element
Down
1
Element found in all living things
2
Molten rock beneath Earth surface
3
Mass per unit volume
7
Unit of force
8
Unit of heredity
9
Unit of electric potential