Across
1
Second lightest element
5
Solid with repeating atomic pattern
6
Path of a planet around the sun
7
Basic unit of life
8
Unit of heredity
10
Hottest planet in solar system
Down
2
Biological catalyst
3
Absolute temperature scale unit
4
Chemical element in table salt
7
Reddish electrical conductor
9
Group of similar cells
11
Curved glass that refracts light