Across
1
Positive particle in nucleus
3
Hottest planet in solar system
5
Chemical element in table salt
6
Biological catalyst
Down
2
Our home planet
3
Unit of electric potential
4
Nerve cell in the brain
7
Force that attracts objects together
8
The Red Planet
9
Amplified beam of light
10
Infectious microscopic agent
11
Push or pull on an object