Across
1
Ball of burning gas in space
3
Substance with pH above 7
5
Measure of matter in an object
7
Mass per unit volume
8
Positive particle in nucleus
11
Push or pull on an object
Down
2
Unit of force
4
Glass that splits light into spectrum
6
Chemical element in table salt
9
Gas essential for breathing
10
Unit of electric potential
12
Reddish electrical conductor