Four of these were included on the list in 2016. Russian scientist Dmitri Mendeleev is usually credited with the first known publication of a periodic table of elements… Many other scientists them jumped in and proved that certain elements existed. The number of each element corresponds to the number of protons in its nucleus (which is the same as the number of electrons orbiting that nucleus). Those fundamental trends are still those that are used today when organizing the modern periodic table. The periodic table is an arrangement of the elements in order of their atomic numbers so that elements with similar properties appear in the same vertical column or group. Each fits properly into a group of elements with similar properties. These are Nihonium (113), Moskovi (115), Tennessine (117), and Oganesson (118). The table is the arrangement of elements in increasing order of their atomic numbers. The modern periodic table (May 2012) contain 118 chemical elements. The metal elements are found on the left hand side of the periodic table, and the non-metal elements are found on the right. Modern Periodic Table: A tabular arrangement of elements in groups and periods which highlights the regular trends in properties of elements is defined as the periodic table. The most recently discovered element, Ununoctium, was first reported by Russian scientists from Dubna in 2002. Learn what element blocks are and their properties and characteristics. Current Number of Elements. Many new elements have been discovered, while others have been artificially synthesized. The periodic table of elements can be organized by blocks (s, p, d, f, g). Moseleys Periodic Law: He stated that the properties of elements are periodic functions of their atomic number. The modern periodic table is the present form of the periodic table. 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