Across
1
Precious yellow metallic element
3
Gas essential for breathing
5
Blocking of light by a celestial body
9
Smallest unit of an element
Down
2
Natural satellite of Earth
4
Unit of heredity
6
Positive particle in nucleus
7
Measure of matter in an object
8
Reddish electrical conductor
10
Force that attracts objects together
11
Naturally occurring inorganic solid