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History of the Periodic Table

  • The periodic table was created in 1869.
  • When the periodic table was made there were already 63 elements found.
  • The first element, phosphorous, was found in 1649.

Elements Structure

  • Each element is made up of different atoms.
  • The atoms inside of elements can be large or small.
  • Every element has a certain number of protons and electrons.
  • If the atomic number changes it becomes a different element.

Dmitri Mendeleev

  • Dmitri Mendeleev was a Russian chemist and inventor.
  • Dmitri created a periodic table of his own, in which the atomic mass increased from left to right.
  • He left 3 blank spaces for the elements we haven't found yet.

Atomic Structure

  • The atomic structure is the structure of an atom.
  • The structure of an atom consist of a positively charged nucleus surrounded and neutralized by negatively charged electrons that orbit around it the nucleus.
  • Atoms have three subatomic particle known as protons, neutrons, and electrons.

Particles of Atoms and their Charges

  • The are three particles of an atom are protons, neutrons, and electrons.
  • Protons have a positive charge and are found inside the nucleus of an atom.
  • Neutrons have a neutral charge and also found inside the nucleus.
  • Electron have a negative charge and are found surrounding the nucleus.

Symbols

  • A symbol is a design that stands for something.
  • A symbol is a visual image.

Alien Periodic Table

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