* Left: A usual Periodic Table of Elements (PTE). * Right: An pyramidal PTE is a three-dimensional  arrangement of this PTE:
* Click on the  right photo to have a pattern for the element pyramide.
* Make a print-out, cut it out, fold it along the 4 lines between s and f, between f and d,
   between d and p, and behind p. Glew the rim behind p.
The element pyramid helps you to understand how the atoms of the elements magnesium and Oxygen react to forme the compound magnesium oxide.
Elements are substances that cannot be decomposed into other substances by chemical reactions.
Elements are usually arranged in the  Periodic Table of Elements  (PTE) following increasing numbers of these elements.
* Left: There are 7 horizontal lines ("periods" 1- 7) and  8 vertical lines ("main groups" I - VIII).
   The first period shows the element Nr.1 H (hydrogen) followed by Nr. 2 He (helium) .
   Elements Nr. 3 Li (lithium) and Nr. 4 Be (beryllium) are seen in period 2.
   Group VIII contains the noble gases: He, Ne Ar, Kr. Xe, Rn.
* Right photo: An element pyramid is an threedimensional arrangement of the PTE.
   You can observe the main groups III, IV, V, VI, VII, VIII, I, II.
* Click the left photo to obtain a copy for making an element pyramid.
* Cut this copy, fold it along the four lines between s and f, between f and d, between d and p, behind p.
   Fix the edge behind p under s with glue.
The three-dimensional arrangement of the elements in the pyramid will help you to understand how atoms form molecules and clusters.