List of chemical elements Wikipedia ~ This is a list of the 118 chemical elements which have been identified as of 2019 A chemical element often simply called an element is a species of atoms which all have the same number of protons in their atomic nuclei the same atomic number or Z Perhaps the most popular visualization of all 118 elements is the periodic table of the elements a convenient tabular arrangement of

Octasulfur Wikipedia ~ Octasulfur is an inorganic chemical with the chemical formula S is a yellow solid and is odourless and tasteless It is the most common allotrope of is a major industrial chemical that occurs widely in nature

Groundhog Day Wikipedia ~ The observance of Groundhog Day in the United States first occurred in German communities in Pennsylvania according to known records The earliest mention of Groundhog Day is an entry on February 2 1840 in the diary of James L Morris of Morgantown in Pennsylvania Dutch Country according to the book on the subject by Don was a Welsh enclave but the diarist was commenting on his

Sulfur Wikipedia ~ Physical properties Sulfur forms polyatomic molecules with different chemical formulas the bestknown allotrope being octasulfur cycloS point group of cycloS 8 is D 4d and its dipole moment is 0 D Octasulfur is a soft brightyellow solid that is odorless but impure samples have an odor similar to that of matches It melts at 11521 °C 23938 °F boils at 4446 °C 8323 °F

Silver azide Wikipedia ~ Pure silver azide explodes at 340 °C but the presence of impurities lowers this down to 270 °C This reaction has a lower activation energy and initial delay than the corresponding decomposition of lead azide Safety AgN 3 like most heavy metal azides is a dangerous primary explosive

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Chemical element Wikipedia ~ A chemical element is a species of atom having the same number of protons in their atomic nuclei that is the same atomic number or Z For example the atomic number of oxygen is 8 so the element oxygen consists of all atoms which have 8 protons One hundred eighteen elements have been identified the first 94 occur naturally on Earth and the remaining 24 are synthetic elements

Aluminium phosphide Wikipedia ~ Aluminium phosphide aluminum phosphide is a highly toxic inorganic compound with the chemical formula Al P used as a wide band gap semiconductor and a fumigant This colorless solid is generally sold as a greygreenyellow powder due to the presence of impurities arising from hydrolysis and oxidation

15 Orionis Wikipedia ~ 15 Orionis is a suspected astrometric binary star system in the equatorial constellation of Orion near the border with Taurus It is visible to the naked eye as a faint yellowwhite hued star with an apparent visual magnitude of 482 The system is approximately 340 light years away from the Sun based on parallax

Lanthanum Wikipedia ~ Lanthanum is a chemical element with the symbol La and atomic number 57 It is a soft ductile silverywhite metal that tarnishes slowly when exposed to air and is soft enough to be cut with a knife It is the eponym of the lanthanide series a group of 15 similar elements between lanthanum and lutetium in the periodic table of which lanthanum is the first and the prototype