Electron configuration

Bohr-Sommerfeld model

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This article provides answers to the following questions, among others: What main innovation did Sommerfeld introduce?How many sub shells does a main shell have?How many electrons...
Atomic model of Bohr (shell model)

Bohr’s atomic model

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This article provides answers to the following questions, among others: What is meant by a shell?What is a postulate?What distinguishes the ground state of an atom?How...
Rutherford's gold foil experiment

Rutherford’s atomic model

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This article provides answers to the following questions, among others: What is the setting of the gold foil experiment?What are α-particles?What conclusion can be drawn from the...
Main group in the periodic table

Periodic table

This article provides answers to the following questions, among others: How are the elements arranged in the periodic table?What are the periods in the periodic table?Why...
Classification of matter

Classification of matter

This article provides answers to the following questions, among others: How can substances be classified?What is the difference between a pure substance and a mixture?What is...
Structure of matter

Structure of matter

This article provides answers to the following questions, among others: How is a substance constructed at the atomic level?What is a molecule?What is meant by a...