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Electron configuration of elements

Bohr-Sommerfeld model

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The Bohr-Sommerfeld model is an extension of the Bohr model. It explains the distribution of electrons within the shells. The weaknesses of the Bohr model could be partially eliminated by the physicist...
Atomic model of Bohr (shell model)

Bohr’s atomic model

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According to the Bohr's atomic model, electrons move on discrete shells around the nucleus (discrete energy levels). The Rutherford model in many cases provides a very good explanation of physical processes in...
Rutherford's gold foil experiment

Rutherford’s atomic model

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According to Rutherford's atomic model, negatively charged electrons move around a positively charged atomic nucleus. In 1910, the physicist Ernest Rutherford found that when a thin gold foil was bombarded with α-particles...
Main group in the periodic table

Periodic table

In the periodic table all chemical elements are classified according to their atomic number and their chemical properties. In the periodic table all chemical elements are classified according to their atomic number...
Classification of matter

Classification of matter

Substances can be categorized into different groups, such as pure substances or mixtures, depending on their structural composition. First, you can distinguish between pure substances and mixtures. Pure substances contain only one...
Structure of matter

Structure of matter

Matter is made up of microscopic units called atoms. An atom consists of a positively charged atomic nucleus (protons and neutrons) and a negatively charged electron shell (electrons). Atomic structure Matter is made...