The periodic table's organization provides important information about an element's structure and properties. Read on to learn more about how the periodic table was made over 150 years ago and why ...

By the periodic table’s logic, all d-block elements should have filled s orbitals. But copper defies that logic. It should have the electron configuration [Ar] 3d 9 4s 2 .

The periodic table stares down from the walls of just about every chemistry lab. The credit for its creation generally goes to Dimitri Mendeleev, a Russian chemist who in 1869 wrote out the known ...

Mendeleev left blank spaces in his original periodic table so that he could properly line up the known elements. Gallium, element 31, was his first gap to be filled, in 1875.

Elements in the periodic table are arranged in order of increasing atomic number. The atomic number represents the number of protons in an atom's nucleus, uniquely identifying each element.

The periodic table is 150 ... the halogens – fluorine (F), chlorine (Cl), bromine (Br), and Iodine (I) ... All of which go to show how the periodic table of elements has become the iconic symbol ...

The elements that fall on each of the wheel’s spokes share common properties just as those in a column (group) do so in today’s table. There was also Henry Basset’s rather odd “dumb-bell ...