Across
1
Unit of heredity
3
Group of similar cells
6
Chemical element in table salt
9
Naturally occurring inorganic solid
Down
2
Magnetic metallic element
4
Icy body with a tail near the sun
5
Amplified beam of light
7
Second lightest element
8
Substance with pH above 7
10
Unit of electric potential
11
Unit of force
12
Ball of burning gas in space