Formation of hydrogen molecules
Hydrogen atoms within hydrogen molecules are held together by a covalent bond.
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Major phases in the history of theories and views about the structure of the atom.
In benzene there are sigma bonds and delocalised pi bonds between carbon atoms.
This animation shows the electron configuration of the calcium atom.
Colourless, odourless, lighter-than-air gas. The most common chemical element in the universe.
This animation demonstrates the structure of nitrogen molecules, with one sigma and two pi bonds holding the atoms together.
A yellow-green toxic gas with a strong odour, one of the halogens.
A fuel cell provides environment-friendly electric energy produced by the chemical reaction between oxygen and hydrogen.
Nuclear fusion will serve as an environmentally friendly and practically unlimited source of energy.
A colourless, odourless, non-reactive gas, it constitutes 78.1% of Earth´s atmosphere.
A colourless, odourless gas, an important component of the atmosphere, indispensable to sustain terrestrial life.
Knallgas is the mixture of hydrogen and oxygen. It will explode when ignited.
A Zeppelin is a type of rigid-framed airship.
A Zeppelin is a type of controllable, rigid airship.
The diameter of the Sun is about 109 times that of the Earth. Most of its mass consists of hydrogen.
Geckos can walk on walls or even ceilings. The 3D scene explains this ability.
An exercise about different types of bonds.