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Introduction Atoms are very small particles that make up everything including humans, animals and the world around us. An atom is made up of particles, which revolve around a nucleus. The particles are protons, electrons and neutrons. These particles are each in turn different. Protons have a positive charge, electrons have a negative charge while neutrons are neutral and carry no charge. The only similarities, which 2 of the particles have, are protons and neutrons and their mass is equal to the mass of an atom of hydrogen. While scientifically we call this mass one atomic mass unit. The mass of an atom depends on the amount of protons and neutrons the atom contains and the arrangement of particles within the atom. The arrangement of the particles within an atom depend on how they are positioned because every atom has a nucleus which the protons and neutrons occupy, while the electrons move...

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