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en.wikipedia.org/wiki/Boron_group

The boron group are the chemical elements in group 13 of the periodic table, comprising boron .... All of the boron-group elements are known to form a trivalent oxide, with two atoms of the element bonded .... Almost never found free in nature , it is very low in abundance, composing only 0.001% (10 ppm) of the Earth's crust.

en.wikipedia.org/wiki/Radionuclide

A radionuclide is an atom that has excess nuclear energy, making it unstable. This excess ... Even the lightest element, hydrogen, has a well-known radionuclide, tritium. Elements heavier than ... Many of these radionuclides exist only in trace amounts in nature, including all cosmogenic nuclides. Secondary radionuclides ...

www.answers.com/Q/What_are_Active_elements_that_never_exist_alone_in_nature

What is the smallest unit of an element that can exist either alone or in combination? ... Several elements aren't found in their elemental form in nature: mostly alkali metals and ... Active elements that never exist alone in nature are known as?

www.chemistryexplained.com/elements/C-K/Gold.html

Gold has been called the most beautiful of all chemical elements. Its beauty has ... Gold occurs in nature in both its native state and in compounds. The native ...

www.reference.com/science/active-element-group-17-eb008dac001bfd9f

The most active element in group 17 (the Halogens) is fluorine. ... The halogens exist as diatomic molecules in the form of X2. ... Active Elements that Never Exist Alone in Nature are Known as · Chemically Active Elements · Elements of Group  ...

www.encyclopedia.com/science-and-technology/chemistry/compounds-and-elements/hydrogen

Together, these two elements make up 99.9% of all known matter in the entire ... protons in the nucleus, it is natural that helium is the element usually formed; yet it is ... Because it bonds so readily with other elements, hydrogen almost never ..... A term describing an element that exists as molecules composed of two atoms .

chem.libretexts.org/LibreTexts/ChemTutor/Periodic_Table_of_the_Elements

Oct 2, 2013 ... The Periodic Table of the Elements is just a way to arrange the ... and 71-80 and 103 up) have never been adequately placed into the ... No element greater than #92 is found in nature. ... in chemical equations, we represent the elements by the symbol alone .... Some very active metals will react with water.

www.encyclopedia.com/science-and-technology/chemistry/compounds-and-elements/halogen-elements

Get information, facts, and pictures about Halogen elements at Encyclopedia.com . ... had any way of knowing about electrons, let alone electron configurations. ... Due to this high level of reactivity, the halogens are almost never found in pure form .... yet it also exists in harmless compounds, primarily in the mineral known as ...

plato.stanford.edu/entries/fleck

Mar 19, 2012 ... A thought style consists of the active elements, which shape ways in ... What we call “facts”, are social constructs: only what is true to culture is true to nature. .... we will never know whether and how that picture is similar to what exists ... would not cross their minds if they were alone and which they would not ...