The zigzag, staircase, line in the diagram of the periodic table above separates the metals, on the left, from non-metals, on the right. Hydrogen is a non-metal, but it is often put in the middle.

Periodic Table as Arranged by Mendelejeff attention ... 61.0 («S) Cr 62.0. (I.) Mn .”93 «« Fe Co Ni 66.84 118.97 88.68 («?) (ss). Kr 82.92 (38) Cu 63.67 (S9) Zn, 68.37 (SO,) Ga 69.9 (81 ...

You may use table navigation commands for the screen reader of your choice. The Periodic Table of Elements. Each entry contains the atomic number, chemical symbol, and atomic mass to two decimal ...

When the first periodic table was formulated by Mendeleev ... The official discovery of element-43 is accorded to Emilio Segrè and co-workers. Technetium, as they called it, was the last of ...

Want to learn more about this centerpiece of chemistry? Take your pick from this collection of links about elements and the periodic table! Build an element ball, solve periodic puzzles, and check out ...

On 17 February 1869, Russian chemist Dmitri Mendeleev jotted down the symbols for the chemical elements, putting them in order according to their atomic weights and inventing the periodic table.

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 ...