1.
The smallest particle of an element (4)
2.
Two or more atoms joined together (8)
3.
A substance made of two or more elements chemically joined (8)
4.
A process where substances change into new substances (8)
5.
The star at the center of our Solar System (3)
6.
A large body that moves around a star (6)
7.
The path something takes as it moves around another object (5)
8.
The force that pulls objects toward each other (7)
9.
A negatively charged particle (8)
10.
A positively charged particle (6)
11.
A particle in the nucleus with no charge (7)
12.
The ability to do work or cause change (6)
14.
A chunk of ice and dust that orbits the Sun (5)
15.
A rocky object that orbits the Sun (8)
16.
How fast a chemical reaction happens (12)
