Across
1
Solid with repeating atomic pattern
4
Gas form of a liquid
5
Absolute temperature scale unit
6
Center of an atom or cell
7
Our home planet
11
Smallest unit of an element
12
Element found in all living things
Down
2
Second lightest element
3
Gas essential for breathing
8
Molten rock beneath Earth surface
9
Magnetic metallic element
10
Unit of power