The periodic table of the chemical elements is found ... number 103 (along with the element that sits above it, lutetium, number 71). Typically you’ll find lawrencium at the bottom right ...

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

The periodic table is arranged in order of increasing atomic number (left to right ... called the lanthanoids (elements 57 to 71) and actinoids (elements 89 to 103), below the main table.

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 ...

mass number = protons + neutrons. Name the first 20 elements. The first 20 elements of the periodic table are as follows: H – Hydrogen, He – Helium, Li – Lithium, Be – Beryllium ...

“The periodic table is something fundamental,” says ... Researchers detected isotopes of lanthanide elements (atomic numbers 57 to 71) in that merger but, as they reported in Nature at the ...

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 ...