Since then, the periodic table has evolved to reflect over 150 years of scientific development and understanding in chemistry and physics. Today, with 118 known elements, it is widely regarded as one ...

But how many of these elements do you know? Test your knowledge and compete with other Live Science readers to see who can ...

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 ...

Each square in the table contains an element symbol of one or two letters ... Share this short film with your students, in which science presenter Jon Chase uses universal indicator to measure ...

In the modern periodic table, elements are in order of atomic number in periods and groups. Electronic structures model how electrons are arranged in atoms. Groups in the periodic table - AQA ...

At the middle of the 19th century, 63 chemical elements were known to science. Before Mendeleev ... With this in mind, in 1869, Mendeleev put together a table that he called The Experiment ...

An Australian man described as a "science nerd" may face jail time, after attempting to collect all the elements in the ...