Across
1
Center of an atom or cell
4
Unit of power
7
Fourth state of matter
8
Unit of electric potential
9
Gas essential for breathing
10
Blocking of light by a celestial body
Down
2
Curved glass that refracts light
3
Solid with repeating atomic pattern
5
Mass per unit volume
6
Compound containing oxygen
7
Glass that splits light into spectrum
11
Second lightest element