Across
1
Center of an atom or cell
4
Biological catalyst
6
Curved glass that refracts light
7
Unit of power
8
Push or pull on an object
9
Unit of electric potential
11
Smallest unit of an element
12
Second lightest element
Down
2
Element found in all living things
3
Unit of force
5
Unit of heredity
6
Amplified beam of light
9
Hottest planet in solar system
10
Force that attracts objects together