Across
1
Second lightest element
4
Chemical element in table salt
6
Amplified beam of light
8
Unit of power
10
Curved glass that refracts light
Down
2
Substance with pH below 7
3
Measure of matter in an object
5
Hottest planet in solar system
7
Gas form of a liquid
9
Unit of force
11
Natural satellite of Earth
12
Unit of energy