Across
1
Solid with repeating atomic pattern
5
Precious yellow metallic element
6
Amplified beam of light
7
Center of an atom or cell
9
Icy body with a tail near the sun
Down
1
Basic unit of life
2
Chemical element in table salt
3
Molten rock beneath Earth surface
4
Mass per unit volume
7
Nerve cell in the brain
8
Gas essential for breathing
10
Substance with pH above 7