A small piece of sodium metal is placed in water. The sodium reacts with the water and gets very hot, producing sodium hydroxide and hydrogen gas. The demonstration shown in this video is very ...

The earliest attempt to classify the elements was in 1789, when Antoine Lavoisier grouped the elements based on their properties into gases, non-metals, metals and earths. Several other attempts ...

They all have a link to the periodic table, which turned 150 in 2019 ... That doesn’t make this gas any less heroic though: during the Cold War, its radioactive isotope Kr-85 was used to ...

such as metals or gases, while also giving each individual element its own chemical symbol. In this periodic table of ...

It was debated whether the 'inert' monoatomic gases belonged to the periodic table owing to their lack of 'chemical properties'; elements coming late to the party, with no unpaired electrons to ...

How is the table organized? The Periodic Table, first compiled by Russian chemist Dmitri Mendeleyev, is organized by the number of protons in the nucleus of each element's atom, known as the ...

That’s why this periodic table clock really caught our eye. [gocivici]’s idea is a simple one: light up three different elements with three different colors for hours, minutes, and seconds ...

Can they extend the periodic table beyond the 118 in it now ... of materials and society at the University of College London and the author of “It’s a Gas: The Sublime and Elusive Elements That Expand ...