masses and charges of subatomic particles

 1.15 Sub atomic particles  Students should: 1.15 know the structure of an atom in terms of the positions, relative masses and relativecharges of sub-atomic particles. Here we look at the particles inside the atom. Sub atomic particles are the particles found inside atoms. These include protons, neutrons and electrons: protons a...

The mass spectrum of boron

 1.17 Activity 2. Calculating relative atomic mass.  Students should: 1.17 be able to calculate the relative atomic mass of an element (Ar) from isotopicabundances.  Sorting by mass A mass spectrometer is an instrument which can separate and sort the particles in a sample of an element according to their mass. The output from a ...

 1.16 Activity 1. Three types of carbon atom  Students should: 1.16 know what is meant by the terms atomic number, mass number, isotopes and relative atomic mass (Ar). Use this animation to explore the number and type of sub atomic particles which make up the three isotopes of carbon. Use the information to complete a copy of th...

If a nucleus was the size of a raisin, the rest of the atom would be the size of a sports stadium

 Atomic models Atoms are the building blocks of matter. Atoms are the smallest possible particles into which an element can be subdivided, without changing its properties.  As building blocks, they can be thought of spheres.  However, to understand how and why atoms join up with one another, a more sophisticated model is needed....