Across
1
Positive particle in nucleus
4
Ball of burning gas in space
7
The Red Planet
8
Center of an atom or cell
10
Precious yellow metallic element
11
Gas essential for breathing
Down
1
Glass that splits light into spectrum
2
Chemical element in table salt
3
Path of a planet around the sun
5
Amplified beam of light
6
Element found in all living things
9
Substance with pH below 7