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 relativecharg...

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) ...

 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...

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, withou...