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The periodic table of elements is a chemistry reference that lists elements by increasing atomic number, which typically correlates to their atomic masses. The atomic number increases from left to right as well as from top to bottom. Each of the rows on the table is a period.


There are 118 known elements on the periodic table. The most recently discovered element, Ununoctium, was first reported by Russian scientists from Dubna in 2002.


The periodic table was built to show the relationships among the various elements. The periodic table was constructed in 1869 by Dmitri Mendeleev.


As of 2014, there are 84 metal elements on the Periodic Table of Elements, four of which are unnamed at this time. Metals are one of three classifications of the elements: there are metals, nonmetals and metalloids. Named and unnamed elements are being added as more substances are discovered.


The periodic table can be filled by tabulating elements in order of increasing atomic number. This method was first devised by Russian chemist Dmitri Ivanovitch Mendeleev in 1869 and has been used in physical and chemical science since.


There are at least 76 solid elements in the periodic table. Eleven elements are gases at room temperature, while only three are liquids. Only the first 98 elements in the periodic table exist in nature.


The father of the periodic table is Dmitri Mendeleev, a Russian chemist who started creating it in 1869. While he is the father of the periodic table, other scientists contributed to the periodic table that people use today.


While the invention of the periodic table of elements is commonly attributed to Dmitri Mendeleev, the atomic weight sorting system was first conceptualized in 1862 by Alexandre-Emile Béguyer de Chancourtois. Despite releasing his table seven years before Mendeleev, Chancourtois' status as a geologis


The horizontal rows on the periodic table of the elements are called periods. Every element in a period has the same number of atomic orbitals. For instance, hydrogen and helium are in the first period, so they both have electrons in one orbital.


In a color-coded periodic table of the elements, the box for each element is colored. This color represents the classes of elements, which include metals, metalloids and non-metals. In general, the color blue is used for metals, orange for metalloids and green for non-metals. The periodic table may