Science 1

• Dmitri Mendeleev published his scheme for the periodic table


  1869
• Periodic table


  Shows all the chemical elements and arranges them based on their properties
• Mendeleev's periodic table was successful in demonstrating its value
• Alexandre-Emile Béguyer de Chancourtois


  A French geologist who arranged the elements spirally around a cylinder, listing them by increasing atomic mass
• John Newlands


  An English chemist who proposed another way of classifying and organizing the 62 elements known at the time
• The periodic table is divided into periods (horizontal rows) and groups (vertical columns)
• Transition metals


  Labeled IIIB to IIB in the periodic table
• Noble gases


  The last row in the periodic table (group 18)
• Carbon family


  Elements with properties quite different from the alkali metals
• Alkali metals


  Elements that have a low ionization energy and easily form positive ions
• The International Union of Pure and Applied Chemistry (IUPAC) is the organization responsible for the periodic table
• Johann Wolfgang Döbereiner


  A German chemist who noticed that the atomic weight of strontium fell midway between the atomic weights of calcium and barium
• Jakob Berzelius


  A Swedish chemist who published a table listing the atomic weights of 54 elements
• Dmitri Ivanovich Mendeleev - Russian chemist who arranged the elements in order of increasing atomic weight
• Dmitri Ivanovich Mendeleev - Russian chemist who published his scheme first
• table of elements
• In his periodic table, a number of elements should have appeared
• Period - the first row in the Periodic Fab
• Average atomic mass- the onerage mass of an elements atom
• horris Travesand William Ramsay
• Noble gases - Argon (Greek word Argos" The Lazy ones)
• Helium (Greek word helius "sun"). 1895 =
• Gripton "Hidden"
• Neon "New"
• Xenon "stranger"
• IUPAC - International Union of Pure and Applied Chemistry
• IUPAC published books and in every back they published, it has it's own and
• Natalia Tarasova

  the president of IUPAC in 2016-2017
• HUPAC in 2023


  Gare's Martiner - Spanish president
• Ehud keinan

  Isreal president of in 2024