Across
1
Smallest unit of an element
2
Particle of light
4
Measure of matter in an object
8
Reddish electrical conductor
9
Curved glass that refracts light
10
Icy body with a tail near the sun
11
Absolute temperature scale unit
12
Magnetic metallic element
Down
2
Positive particle in nucleus
3
Naturally occurring inorganic solid
5
Hottest planet in solar system
6
Chemical element in table salt
7
Unit of electric potential