1.
The tiny particle that makes up all matter.
2.
A positively charged particle found in the nucleus.
3.
A particle with no charge found in the nucleus.
4.
A negatively charged particle that moves around the nucleus.
5.
The centre of an atom containing protons and neutrons.
6.
A pure substance made of only one type of atom.
7.
A substance made from two or more different elements chemically bonded together.
8.
A group of atoms joined together.
9.
A chart that organises all known elements.
10.
An element that is usually shiny and conducts heat and electricity.
11.
An element that is usually dull and does not conduct electricity well.
12.
An element with properties of both metals and non-metals.
13.
Energy released from unstable atoms.
