Everything in the world is made up of atoms. The structure of the atom is what gives an element its chemical and physical properties. Negatively charged particles that spin around the positive ...

These substances are called compounds. This is shown in the diagram below There are millions of different compounds and all of them have different properties. The properties of compounds are ...

(London and Toronto: Hodder and Stoughton, Ltd., 1923.) 2s. 6d. net. (2) The Atom and the Bohr Theory of its Structure: an Elementary Presentation. By H. A. Kramers Helge Holst. Translated from ...