Molecule exercises I (Bonds)
An exercise about different types of bonds.
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- Which molecule has a tetrahedral shape?
- Pick the molecule in which the angle of the bond is about 120°!
- In which molecule does a non-bonding pair of electrons belong to the central atom?
- Pick the molecule in which the central atom has a valence of 4?
- Which molecule contains a pi bond?
An exercise about the polarity of molecules.
An exercise about the groups and structure of organic nitrogen compounds.
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.
Hydrogen atoms within hydrogen molecules are held together by a covalent bond.
Colourless, odourless, lighter-than-air gas. The most common chemical element in the universe.
A colourless, odourless, non-reactive gas, it constitutes 78.1% of Earth´s atmosphere.
This animation demonstrates the structure of nitrogen molecules, with one sigma and two pi bonds holding the atoms together.