Across
1
Unit of energy
4
Measure of matter in an object
5
Group of similar cells
8
Unit of heredity
9
Reddish electrical conductor
13
Gas form of a liquid
Down
2
Compound containing oxygen
3
Second lightest element
6
Curved glass that refracts light
7
Smallest unit of an element
10
Force that attracts objects together
11
Glass that splits light into spectrum
12
Amplified beam of light