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Major phases in the history of theories and views about the structure of the atom.
atomic model, Democritus, Dalton, Thomson, Rutherford, Bohr, Sommerfeld, Heisenberg, Schrödinger, nucleus, electron cloud, atomic structure, proton, electron, neutron, elementary particles, atomos, excitation, spectrum, quantum mechanics, chemistry
According to Democritus and his master, Leucippus, matter is made up of tiny, indivisible particles called atoms. According to their model, atoms exist eternally: they are neither destroyed, nor produced; they can be different in size and shape, and they might be connected through small hooks.
The peculiarities of atoms define the characteristics of different materials. For example, the roundish atoms with hooks shown in the animation have a bitter taste and they are sticky. Sweet materials are small and round. Therefore, they are able to infiltrate different materials, changing their taste.
Today we know that this naive atomic model is not correct; however, this theory is important in the history of science, because it marked the birth, in the 4th-5th centuries B.C., of the notion of the non-continuous, quantized nature of matter.
Electric current of small voltage can be created by using fruit, similarly to the Daniell cell.
Aluminium smelting is the process of extracting aluminium from alumina by electrolysis.
During the substitution reaction the hydrogen atoms of methane are substituted with...
An exercise about compound ions.
The method of separation of substances in a mixture depends on their different properties.
We can witness a surprising 'performance' thanks to the special abilities of elastomers.
We can generate electricity with the help of a salt bridge and by immersing a zinc electrode in...
Change in the colour of the cobalt(II) chloride solution due to heating and cooling.