It is even less abundant than the so-called rare earths. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.Gold is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal.

Arsenic is a metalloid.Strontium is an alkaline earth metal, strontium is a soft silver-white yellowish metallic element that is highly reactive chemically.Einsteinium is the seventh transuranic element, and an actinide.It is a soft, silvery-white alkali metal. There are over 100 different borate minerals, but the most common are: borax, kernite, ulexite etc. The ionization energy is the energy required to remove an electron from its orbital around an atom to a point where it is no longer associated with that atom. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. It is a lanthanide, a rare earth element, originally found in the gadolinite mine in Ytterby in Sweden.Tin is a post-transition metal in group 14 of the periodic table. Because of its high chemical reactivity, barium is never found in nature as a free element. Thus the first IE of nitrogen greater than oxygen and phosphorus greater than sulfur.According to Hund’s rule, half-filled or fully-filled orbital comparatively low energy or more stable. Antimony compounds have been known since ancient times and were powdered for use as medicine and cosmetics, often known by the Arabic name, kohl.Barium is the fifth element in group 2 and is a soft, silvery alkaline earth metal. The chemical symbol for Helium is He.Vanadium is a hard, silvery grey, ductile, and malleable transition metal. Halogens can capture an electron easily as compared to elements in the first and second group. Tungsten is an intrinsically brittle and hard material, making it difficult to work.Terbium is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife. Only about 5×10−8% of all matter in the universe is europium.Manganese is a metal with important industrial metal alloy uses, particularly in stainless steels.Nitrogen is a colourless, odourless unreactive gas that forms about 78% of the earth’s atmosphere. The first chemical element is Cesium and the last one is Helium.For chemistry students and teachers: The tabular chart on the right is arranged by Ionization energy.Copyright © 1998-2018 Lenntech B.V. All rights reservedPlease note that the elements do not show their natural relation towards each other as in the Periodic system. The metal is found in the Earth’s crust in the pure, free elemental form (“native silver”), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite.Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point.

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