Across
1
Group of similar cells
4
Smallest unit of an element
5
Second lightest element
6
Molten rock beneath Earth surface
9
Blocking of light by a celestial body
10
Nerve cell in the brain
11
Positive particle in nucleus
Down
2
Chemical element in table salt
3
Unit of energy
6
Naturally occurring inorganic solid
7
Reddish electrical conductor
8
Magnetic metallic element