Across
1
Biological catalyst
5
Smallest unit of an element
6
Chemical element in table salt
7
Path of a planet around the sun
8
Ball of burning gas in space
Down
2
Icy body with a tail near the sun
3
Solid with repeating atomic pattern
4
Reddish electrical conductor
7
Compound containing oxygen
9
Substance with pH above 7
10
Measure of matter in an object