Astatine 211 is the product and has a half-life of 7.2 hours. The element can be produced by bombarding targets made of bismuth-209 with high energy alpha particles (helium nuclei). It is radioactive and its name, from the Greek astatos, means "unstable". Chemistry of Astatine (Z=85) Astatine is the last of the known halogens and was synthesized in 1940 by Corson and others at the University of California.The name iodine is taken from the Greek ioeides which means "violet colored". When heated at ordinary air pressures it sublimes to a violet gas. Chemistry of Iodine (Z=53) Elemental iodine is a dark grey solid with a faint metallic luster.An atom of an element is most stable when its outer electron shell is completely filled or half-filled. The charge on an atom is related to its valence electrons or oxidation state. You can use this chart to predict whether or not an atom can bond with another atom. It is an element to be treated with the utmost respect in the laboratory. This is a chart of the most common charges for atoms of the chemical elements.
Chemistry p element skin#
Bromine on the skin causes painful burns that heal very slowly. It is the only non-metal that is a liquid at normal room conditions. It was first isolated in pure form by Balard in 1826. In fact its name is derived from the Greek bromos or "stench".
It is very reactive and is widely used for many purposes, such as as a disinfectant. Chemistry of Chlorine (Z=17) Chlorine is a halogen in group 17 and period 3.It is a nonmetal, and is one of the few elements that can form diatomic molecules (F2). It is the most electronegative element, given that it is the top element in the Halogen Group, and therefore is very reactive. Its atomic number is 9 and its atomic weight is 19, and it's a gas at room temperature.
Chemistry of Fluorine (Z=9) Fluorine (F) is the first element in the Halogen group (group 17) in the periodic table.Oxidizing Ability of the Group 17 Elements.Includes trends in atomic and physical properties, the redox properties of the halogens and their ions, the acidity of the hydrogen halides, and the tests for the halide ions. Group 17: Chemical Properties of the Halogens Covers the halogens in Group 17: fluorine (F), chlorine (Cl), bromine (Br) and iodine (I).Physical Properties of the Group 17 Elements.Group 17: General Properties of Halogens.Atomic and Physical Properties of Halogens.As a result, there is a regular increase in the ability to form high oxidation states. On the other hand, there is a regular decrease in the first ionization energy as we go down this group. This includes their melting points, boiling points, intensity of their color, the radius of the corresponding halide ion, and the density of the element. Group 17: Physical Properties of the Halogens It can be seen that there is a regular increase in many of the properties of the halogens proceeding down group 17 from fluorine to iodine.
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