Across
1
Gas essential for breathing
5
Unit of power
6
Positive particle in nucleus
7
Reddish electrical conductor
10
Substance with pH below 7
12
Icy body with a tail near the sun
14
Center of an atom or cell
Down
2
Push or pull on an object
3
Unit of heredity
4
Element found in all living things
6
Particle of light
8
Force that attracts objects together
9
Magnetic metallic element
11
Precious yellow metallic element
13
Chemical element in table salt