Interactive Periodic Table Explorer: Discover elements with detailed info, dynamic filters, responsive design, and dedicated pages for each element.

This page uses out understanding of the atomic model and the periodic table to explore the following observations: Character conversation: two pupils discussing PCl5 breaking the octet rule. They alos ...

There is widespread interest in how geochemistry affects the genomic makeup of microbial communities, but the possible impacts of oxidation-reduction (redox) conditions on the chemical composition of ...

The periodic table thus established remained until the ... either plus or minus signs and can also be zero. In the free state an element has the polarnumber of zero, because it entered into ...

1. Demonstrations and videos In the classroom, you can demonstrate or show different elements existing in various states. Solid iodine can be shown to sublime Melting metals - the final seconds of ...

The modern periodic table, arranged in rows and columns, was first introduced by Dmitri Mendeleev in 1869. At the time, it included the known elements and their properties, but Mendeleev predicted ...

Modern periodic law and present form of the periodic table ... of the first-row transition elements - physical properties, ionization enthalpy, oxidation states, atomic radii, colour, catalytic ...

What are Endangered & Critical Elements? Of the 118 elements that make up everything—from the compounds in a chemist’s arsenal to consumer products on the shelf—44 will face supply limitations in the ...

Modern periodic law and present form of the periodic table ... of the first-row transition elements - physical properties, ionization enthalpy, oxidation states, atomic radii, colour, catalytic ...

For all their nobility, elements of group 18 have lived in relative obscurity. In 1869, Mendeleev's first periodic table did not include ... Whether through oxidation, coordination or ionization ...

The story starts at the end of the nineteenth century, when gifted scientists were systematically filling in gaps in Mendeleev's table ... the element's most stable oxidation state is +3, but ...