The periodic table contains an enormous amount of information, but some of the most important are atomic numbers, atomic symbols, and atomic masses. Atomic symbol: The atomic symbol (or element ...

Test your knowledge and compete with other Live Science readers to see who can come top in our periodic table quiz ...

Mendeleev had predicted an element (he called it eka-aluminum) with just that density and an atomic weight of 68 ... number”) determined the correct order of the elements in the periodic table.

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 ...

The elements of the periodic table are defined by the number of protons in the atomic nucleus - the atomic number - so how can there be gaps for new elements? Sure, we could keep adding protons at ...