Across
1
Center of an atom or cell
3
Basic unit of life
4
Smallest unit of an element
5
Positive particle in nucleus
8
Magnetic metallic element
9
Chemical element in table salt
10
Compound containing oxygen
Down
2
Fourth state of matter
3
Element found in all living things
6
Solid with repeating atomic pattern
7
Push or pull on an object
10
Gas essential for breathing
11
Ball of burning gas in space