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 ...

The periodic table - AQA Mendeleev made an early periodic table. In the modern periodic table, elements are in order of atomic number in periods and groups. Electronic structures model how ...

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

Ever since bearded Russian Professor Dmitri Ivanovich Mendeléeff classified the probable chemical elements in 1869 and arranged them in the periodic table, scientists have looked for a fifth ...

February 7 is National Periodic Table Day, when we celebrate the efforts of scientists over the centuries to figure out how different elements ...

The periodic table of elements (often known simply as the periodic table) has been helping scientists with their work for a little over 150 years. The handy visual reference guide organizes known ...

Like the periodic table of elements, which has enabled generations of scientists to predict the existence of yet-undiscovered elements and the behavior of those already known, the brain-cell ...

The periodic table The periodic table is a chart of all the elements arranged in increasing atomic number. Group 1 alkali metals The Group 1 elements, also known as the alkali metals, all react ...