The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic ...

Copper has been used by humans for as much as 7000 years and elements such as gold, silver, tin ... line in the diagram of the periodic table above separates the metals, on the left, from non ...

A very strong neutron emitter, Cf-252 is used in portable metal detectors, for identifying gold and silver ores ... added elements 104 to 106 to the periodic table. In 1964 the first superheavy ...

For the last fifty or so years, the periodic table has been incomplete. Elements after uranium on the periodic table have been synthesized for the past few decades, but there were always a few ...

This year we celebrate the 150 th anniversary of Mendeleev’s achievement in formulating the structure of the periodic table that we use today. He announced his structure in 1869, but the challenge of ...

The periodic table of elements—also known as Mendeleev’s table—was developed in 1869 by Russian chemist Dmitri Mendeleev. It organizes all known chemical elements by their atomic number ...