Across
1
Natural satellite of Earth
3
Push or pull on an object
7
Curved glass that refracts light
8
Absolute temperature scale unit
9
Unit of power
10
Path of a planet around the sun
Down
2
Compound containing oxygen
4
Smallest unit of an element
5
Center of an atom or cell
6
Solid with repeating atomic pattern
11
Gas essential for breathing
12
Positive particle in nucleus