|Element||Atomic number||Atomic weight||Boiling point||Melting point||Density||Heat fusion||Heat vapour||Specific heat capacity||Thermal conductivity|
|Hydrogen||1||1||20.46° K||13.96° K||71 kg/m³|
|Total AVG||20.46° K||13.96° K||71.00 kg/m³|
Atoms are the building blocks of everything. The philosopher Democritus described atoms as being indestructible and completely full. He thought that there were many different kinds of atoms, each distinct in shape and size and that all atoms move around in space.
Dmitri Mendeleev Periodic Table
The table is organised into vertical groups and horizontal periods. Elements are placed along each period in order of their atomic number, with elements 1-2, 3 -10, 11-18 etc. all in the same horizontal row of the periodic table. Groups of elements have similarities in characteristics e.g. group 17 - known as halogens.
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