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 meant by an element?
  • What are chemical compounds?
  • What is the difference between a suspension and an emulsion?
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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 particle?
  • What does an atomic nucleus consist of?
  • Why do not the protons in the nucleus repel each other, causing the nucleus to fall apart?
  • What is an electron shell?
  • What distinguishes a chemical element at the atomic level?
  • What are isotopes?
  • What is an ion?
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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 does the size of atoms increase from top to bottom but decrease from left to right?
  • Which atomic orbitals are occupied by electrons for each element?
  • In which subgroups are the main group elements divided?
  • What are transition metals?
  • What is meant by a metalloid?
  • Which elements are metalloids?
  • How many know elements are metals?
  • What is the meaning of the main group number?
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