There are currently 118 known elements listed on the periodic table; from hydrogen, which has a single proton in its nucleus, ...

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 ...

In most periodic tables hydrogen (H) is shown separately but is still classified as a non-metal. Hydrogen is placed on its own as it is quite a unique element. The periodic table can be read ...

Now in the Periodic Table the valency for oxygen, an electro-negative element, increases regularly as we pass from Group 0 to Group VIII, while that for hydrogen, an electro-positive element ...

It is relative to hydrogen which was assigned a value of 2.20 on the ... which is very practical and accurately reproduces both molecules' energies and chemical reactions. The periodic table's most ...

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 ...

National Periodic Table Day, observed annually on February 7, honors one of the most significant achievements in scientific ...