Across
1
Precious yellow metallic element
3
Particle of light
5
Unit of heredity
6
Naturally occurring inorganic solid
8
Center of an atom or cell
10
Tissue that contracts for movement
11
Positive particle in nucleus
Down
2
Gas essential for breathing
4
Unit of power
6
Measure of matter in an object
7
Hottest planet in solar system
9
Unit of energy