Across
1
Center of an atom or cell
2
Positive particle in nucleus
3
Element found in all living things
6
Amplified beam of light
9
Path of a planet around the sun
10
Substance with pH above 7
11
Push or pull on an object
Down
1
Unit of force
3
Solid with repeating atomic pattern
4
Second lightest element
5
Our home planet
7
Biological catalyst
8
Magnetic metallic element
12
Ball of burning gas in space