Across
1
Precious yellow metallic element
4
Magnetic metallic element
5
Absolute temperature scale unit
6
Biological catalyst
7
Smallest unit of an element
11
Unit of power
13
Basic unit of life
Down
2
Mass per unit volume
3
Gas essential for breathing
8
Center of an atom or cell
9
Gas form of a liquid
10
Chemical element in table salt
12
Amplified beam of light