Across
1
Second lightest element
4
Amplified beam of light
7
Unit of heredity
9
Our home planet
10
Glass that splits light into spectrum
11
Natural satellite of Earth
12
Center of an atom or cell
Down
2
Magnetic metallic element
3
Solid with repeating atomic pattern
5
Biological catalyst
6
Chemical element in table salt
7
Precious yellow metallic element
8
Ball of burning gas in space