Dmitri Ivanovich Mendeleev and Lothar Meyer

• both Dmitri Ivanovich Mendeleev and Lothar Meyer published identical

  methods for classifying elements, working independently.
• Mendeleev and Meyer both arranged elements in increasing

  atomic mass and noticed that repeating patterns appeared in their properties.
• Mendeleev is usually given

  more credit than Meyer for publishing his work earlier and for successfully demonstrating the value of

  his table.
• Mendeleev examined the properties of the known elements by using a set of cards. In separate

  cards, the properties of elements were tabulated.
• Same with Newlands, he noticed a periodic

  repetition of the elements when he arranged them, then he arranged them in a table called

  Mendeleev Periodic Table.
• Medleleev’s law states that “the physical and

  chemical properties of elements are a periodic function of their atomic masses''.
• He was even given credit for the development of

  the first periodic table due to the following reasons:

  • He occasionally broke the pattern of increasing atomic masses to keep elements with similar properties in the Alexandre Béguyer de Chancourtois same columns.
  • He also placed gaps in his periodic table to predict the existence of unknown elements during his time.