Across
1
Substance with pH below 7
3
Unit of energy
6
Second lightest element
7
Solid with repeating atomic pattern
Down
2
Form of thermal energy
4
Mass per unit volume
5
Smallest unit of an element
8
Positive particle in nucleus
Substance with pH below 7
Unit of energy
Second lightest element
Solid with repeating atomic pattern
Form of thermal energy
Mass per unit volume
Smallest unit of an element
Positive particle in nucleus