Hemoglobin is a tetramer that consists of four polypeptide chains. Each monomer contains a heme group in which an iron ion is bound to oxygen. In iron-deficiency anemia, the heart works harder to pump more oxygen through the body, which often leads to heart failure or disease.We are celebrating the 150th anniversary of Mendeleev’s periodic table by highlighting one or more chemical elements with important biological functions each month in 2019. For January, we featured atomic No. 1 and dissected hydrogen’s role in oxidation-reduction reactions and electrochemical gradients as driving energy force for cellular growth and activity.
In February, we have selected iron, the most abundant element on Earth, with chemical symbol Fe (from the Latin word “ferrum”) and atomic number 26.
- Atomic Number 26 is belong to element of Iron. Chemical symbol for Iron is Fe. Number of protons in Iron is 26. Atomic weight of Iron is 55.845 u or g/mol.
- Atomic number 26 - a heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood.
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A neutral iron atom contains 26 protons and 30 neutrons plus 26 electrons in four different shells around the nucleus. As with other transition metals, a variable number of electrons from iron’s two outermost shells are available to combine with other elements. Commonly, iron uses two (oxidation state +2) or three (oxidation state +3) of its available electrons to form compounds, although iron oxidation states ranging from -2 to +7 are present in nature.
Iron occurs naturally in the known universe. It is produced abundantly in the core of massive stars by the fusion of chromium and helium at extremely high temperatures. Each of these supergiant, iron-containing stars only lives for a brief while before violently blasting as a supernova, scattering iron into space and onto rocky planets like Earth. Iron is present in the Earth’s crust, core and mantle, where it makes up about 35 percent of the planet’s total mass.
Iron is crucial to the survival of all living organisms. Biological systems are exposed constantly to high concentrations of iron in igneous and sedimentary rocks. Microorganisms can uptake iron from the environment by secreting iron-chelating molecules called siderophores or via membrane-bound proteins that reduce Fe+3 (ferric iron) to a more soluble Fe+2 (ferrous iron) for intracellular transport. Plants also use sequestration and reduction mechanisms to acquire iron from the rhizosphere, whereas animals obtain iron from dietary sources.
Once inside cells, iron associates with carrier proteins and with iron-dependent enzymes. Carrier proteins called ferritins (present in both prokaryotes and eukaryotes) store, transport and safely release iron in areas of need, preventing excess free radicals generated by high-energy iron. Iron-dependent enzymes include bacterial nitrogenases, which contain iron-sulfur clusters that catalyze the reduction of nitrogen (N2) to ammonia (NH3) in a process called nitrogen fixation. This process is essential to life on Earth, because it’s required for all forms of life for the biosynthesis of nucleotides and amino acids.
Some iron-binding proteins contain heme — a porphyrin ring coordinated with an iron ion. Heme proteins include cytochromes, catalase and hemoglobin. In cytochromes, iron acts as a single-electron shuttle facilitating oxidative phosphorylation and photosynthesis reactions for energy and nutrients. Catalase iron mediates the conversion of harmful hydrogen peroxide to oxygen and water, protecting cells from oxidative damage. In vertebrates, the Fe+2 in hemoglobin is reversibly oxidized to Fe+3, allowing the binding, storage and transport of oxygen throughout the body until it is required for energy production by metabolic oxidation of glucose.
Living organisms have adapted to the abundance and availability of iron, incorporating it into biomolecules to perform metal-facilitated functions essential for life in all ecosystems.
A year of (bio)chemical elements
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Why are elements with atomic number 26 not formed by nuclear fusion in the cores of very massive stars?
1 Answer
Elements with atomic number greater than 26 are not so formed because it is not energetically favorable.
Explanation:
When you fuse four protons and to make a helium-4 nucleus (and also absorb two electrons for charge balance), it's energetically favored because the product nucleus has less energy than what you put in. You started and ended with four nucleons (protons+neutrons=4), for nucleons -- protons plus neutrons -- must be conserved in the fusion reaction. But the helium nucleus has less energy per nucleon than the protons you started with.
Atomic Number 26 Element
Keep fusing neclei and going up in atomic number, and the energy per nucleon keeps going down as you pass through carbon (atomic number 6), oxygen (8), silicon (14), etc. Fusion must conserve total nucleons (= protons+neutrons), but as energy per nucleon decreases you can still release energy.
But at iron (atomic number 26) you have a problem. The energy per nucleon hits a minimum, stops decreasing and goes up again. You can't release energy anymore by fusing iron nuclei. There are other mechanisms for making heavier nuclei such as neutron capture or supernova explosion processes (see https://en.wikipedia.org/wiki/Nucleosynthesis), but these are harder to come by than stellar-core fusion. The abundance of elements beyond iron rapidly falls off.
Atomic Number 26
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