Across
1
Chemical element in table salt
3
Substance with pH above 7
5
Unit of heredity
6
Form of thermal energy
7
Solid with repeating atomic pattern
9
Unit of power
Down
2
Reddish electrical conductor
4
Element found in all living things
6
Second lightest element
7
Icy body with a tail near the sun
8
Amplified beam of light
10
Push or pull on an object
11
Positive particle in nucleus
12
Path of a planet around the sun