Across
1
Chemical element in table salt
3
Our home planet
6
Center of an atom or cell
7
Compound containing oxygen
9
Ball of burning gas in space
13
Icy body with a tail near the sun
Down
2
Unit of electric potential
4
Mass per unit volume
5
Fourth state of matter
8
Amplified beam of light
10
Form of thermal energy
11
Hottest planet in solar system
12
Reddish electrical conductor