Going down group 1, the melting point decreases. Lithium, Li Fizzes steadily; slowly becomes smaller until it disappears Sodium, Na Fizzes rapidly; melts to form a ball; quickly becomes smaller ...

Periodic Table as Arranged by Mendelejeff attention ... Atomic Nurhbers and Isotopic Radioactive- Elements Group 0 Group 1 EitO Group 2 EO Group 3 E2O3 Group 4 EOa EH4 Group'S EzOa EHa Group ...

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 ...

Copper has been used by humans for as much as 7000 years and elements such as gold, silver, tin, lead and mercury have been known for many thousands of years. However, the first scientific ...