Periodic table (polyatomic).svg

Development of the Periodic Table (FINAL)

  • 330

    Aristotle: 4 Element Theory

    Aristotle: 4 Element Theory
    Aristotle proposed the four element theory: earth, air, fire & water
  • Period: 330 to

    Development of the Periodic Table throughout the years

    NOTE: Any events without a specific date (aside from the year) are marked with "Jan 1"
  • 360

    Stoicheia = Elements

    Stoicheia = Elements
    Plato coined the term ‘elements’ (stoicheia)
  • 440

    Atomic Theory (1)

    Atomic Theory (1)
    Democritus and Leucippus proposed the idea of the atom, an invisible particle that makes up all matter
  • The Scientific Method

    The Scientific Method
    Sir Francis Bacon published “The Proficience and Advancement of Learning”, which contained a description of what would later be known as The Scientific Method
  • The Sceptical Chymist

    The Sceptical Chymist
    Robert Boyle published “The Sceptical Chymist”, a treatise on the distinction between chemistry and alchemy. It also contained some of the earliest ideas of atoms, molecules, and chemical reaction marking the beginning of the history of modern chemistry
  • Phosphorus

    Phosphorus was first discovered using scientific reasoning by Hennig Brand.
  • Hydrogen

    Henry Cavendish discovered Hydrogen as colorless, odourless gas that burns and can form an explosive mixture with air
  • Antoine Lavoisier's list of the Elements

    Antoine Lavoisier's list of the Elements
    Antoine Lavoisier wrote the first extensive list of elements containing 33 elements & distinguished between metals and non-metals.
  • Dalton's Law

    Dalton's Law
    John Dalton proposed “Dalton’s Law”, describing the relationship between components in a mixture of gases
  • 47 elements were discovered

    47 elements were discovered
    47 elements were discovered, and scientists began to see patterns in the characteristics
  • Law of Triads

    Law of Triads
    Johann Dobereiner grouped elements with similar properties into groups of three or triads. According to him, nature contained triads of elements, where the middle element had properties that were an average of the other two elements
  • Atomic Weights & Symbols

    Atomic Weights & Symbols
    Jakob Berzelius developed a table of atomic weights and introduced letters to symbolise elements.
  • Atomic Weights

    Atomic Weights
    A.E. Beguyer de Chancourtois was the first to incorporate atomic weights to reveal that elements were arranged according to their atomic weights, with similar elements occurring at regular intervals.
  • Law of Octaves

    Law of Octaves
    John Newlands proposed Law of Octaves; where he stated that elements repeated their chemical properties every eighth element.
  • Meyer's Periodic Table

    Meyer's Periodic Table
    Lothar Meyer developed an early version of the periodic table, with 28 elements in order of their atomic weight.
  • John Newlands arranges the elements

    John Newlands arranges the elements
    John Newlands arranged 56 elements into 11 groups based on characteristics & observed similarities between some elements.
  • Elements: progress

    Elements: progress
    63 elements have been discovered
  • Mendeleev's Periodic Table

    Mendeleev's Periodic Table
    Mendeleev's Periodic Table was the first published periodic table in "On the Relationship of the Properties of the Elements to their Atomic Weights." He left gaps for undiscovered elements, predicting what the properties of these undiscovered elements might be.
  • Radioactivity

    Antoine Bequerel discovered radioactivity.
  • Noble Gases

    Noble Gases
    William Ramsay discovered the noble gases. He realised that they represented a new group in the periodic table.
  • Radioactivity

    Ernest Rutherford discovered the source of radioactivity as decaying atoms
  • Henry Moseley's contribution

    Henry Moseley's contribution
    Henry Moseley determined the atomic number of each of the elements and modified the Periodic Law. He realised that arranging the elements in order of increasing atomic number rather than atomic weight gave a better fit within the periodic table.
  • Protons

    Rutherford first identified protons in the atomic nucleus.
  • Neutrons

    James Chadwick first discovered neutrons.
  • Transuranium Elements

    Transuranium Elements
    Glenn Seaborg discovered the transuranium elements, atomic numbers 94 to 102. He also redesigned the periodic table to its current form after the completion of actinide series

  • Neptunium

    Edwin McMillan and Philip H. Abelson identified neptunium, the lightest and the first synthesized transuranium element, found in the products of uranium fission.
  • Plutonium

    Glenn Seaborg discovered plutonium
  • Actinides

    Glenn Seaborg artifically produced heavy mass elements such as neptunium. These new elements were part of a new block of the periodic table called 'actinides.'
  • Lanthanides & Actinides

    Lanthanides & Actinides
    Glenn Seaborg identified lanthanides and actinides, placing it below the periodic table.