Dmitri Mendeleev is widely credited as the creator of the periodic table. A charismatic Russian scientist who was fascinated by chemistry, Mendeleev came up with the idea to organize chemical elements according to their ... More » Science Chemistry Atoms & Molecules

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 to... More » History Modern History Modern Europe

The periodic table's name comes from the fact that it arranges the elements into repeating sets, otherwise known as "periods." These periods are defined by the covalence of an element, the number of electrons it has in i... More » Science Chemistry
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Mendeleev arranged the periodic table in order of increasing atomic weight of the elements. He determined that there was a pattern when he arranged these elements into horizontal rows. More » Science Chemistry Atoms & Molecules

Dmitri Mendeleev published his periodic table of elements in 1869. His table arranged the known elements according to their chemical properties and in order of their relative atomic mass. This created several gaps in the... More » Science Chemistry

Periodic law, also known as Mendeleev's law, is the concept that the chemical and physical properties of elements are based on an element's atomic weight when arranged by increasing periodic atomic number. Periodic law w... More » Science Chemistry Atoms & Molecules

The Roman numerals on a periodic table of elements define the chemical group of the elements in that column and identify the number of valence electrons of each element. Group IA elements have one valence electron; group... More » Science Chemistry Atoms & Molecules