Welcome to Britannica School, a safe, up-to-date, and age-appropriate information resource for Elementary, Middle, and High School.. Discover encyclopedia articles, multimedia, primary sources, games, and other learning resources that support student research and reinforce curriculum standards.
Chemical Element Pictures - Photo GallerySep 29, 2019 · Stars and this nebula consist mainly of the element hydrogen. NASA/CXC/ASU/J. Hester et al., HST/ASU/J. Hester et al. Hydrogen is the first element on the periodic table, with 1 proton per atom. It's the most abundant element in the universe.If you look at
Element Groups:Alkali Metals Alkaline Earth Metals Transition Metals Other Metals Metalloids Non-Metals Halogens Noble Gases Rare Earth Elements Basic Information Atomic Structure Isotopes Related Links Citing This Page. Basic Information Name:Thallium Symbol:Tl Atomic Number:81 Atomic Mass:204.3833 amu Melting Point:303.5 °C
Chemical Elements - ThalliumOriginal size in cm:0.7 x 1.5. Thallium is a metal which is very similar to lead, but is much more reactive, toxic and rarer than this. Therefore it is used scarcely and only in amounts as small as possible. Poisonings occur by mere skin contact. One application is for special glass.
Encyclopædia Britannica, Ninth Edition/Thallium The chemical character of thallium presents striking peculiarities. Dumas once called it the " ornithorhynchus paradoxus of metals." As an elementary substance, it is very similar in its mechanical and physical properties to lead; like lead it forms an almost insoluble chloride and an insoluble iodide.
Aug 15, 2020 · Thallium has the chemical symbol Tl and atomic number 81. It has the electron configuration \([Xe] 2s^22p^1\) and has a +3 or +1 oxidation state. As stated above, because thallium is heavy, it has a greater stability in the +1 oxidation state (inert pair effect). Therefore, it is found more commonly in its +1 oxidation state.
Matter & Energy Browse - Page 16 BritannicaThallium (Tl), chemical element, metal of main Group 13 (IIIa, or boron group) of the periodic table, poisonous and of limited commercial value. Like lead, thallium is a soft, low-melting element of low tensile strength. Freshly cut thallium has a metallic lustre that dulls to bluish gray upon
Radium - Element information, properties and uses Radium was discovered in 1898 by Marie Curie and Pierre Curie. They managed to extract 1 mg of radium from ten tonnes of the uranium ore pitchblende (uranium oxide, U 3 O 8), a considerable feat, given the chemically methods of separation available to them.They identified that it was a new element because its atomic spectrum revealed new lines.
History. Elements and Periodic Table History. The discovery of thallium was controversial. William Crookes of the Royal College of Science in London was the first to observe a green line in the spectrum of some impure sulfuric acid, and realised that it meant a new element.
Thallium - Periodic Table and Atomic PropertiesAtomic Number Protons, Electrons and Neutrons in Thallium. Thallium is a chemical element with atomic number 81 which means there are 81 protons in its nucleus.Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z.The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs.
Thallium - The Chemical ElementsDescription of Thallium:Very soft, highly malleable and ductile, blue-white shiny metal.
Thallium is a member of the aluminum family, Group 13 (IIIA) on the periodic table. The periodic table is a chart that shows how chemical elements are related to one another. Thallium is also a member of the heavy metals, along with gold, platinum, and lead. Thallium was
Thallium, Chemical Element - uses, elements, metal, Thallium is a member of the aluminum family, Group 13 (IIIA) on the periodic table. The periodic table is a chart that shows how chemical elements are related to one another. Thallium is also a member of the heavy metals, along with gold, platinum, and lead. Thallium was first discovered by
Thallium:Uses, Facts & Properties StudyThallium is element 81 on the periodic table. It has the chemical abbreviation Tl and is a soft, grayish metal that resembles tin. It has the chemical abbreviation Tl and is a soft, grayish metal
Thulium (Tm), chemical element, a rare-earth metal of the lanthanide series of the periodic table. Thulium is a moderately hard, silvery white metal that is stable in air but can easily be dissolved in diluted acidsexcept hydrofluoric acid (HF), in which an insoluble trifluoride (TmF3) layer forms
chemical element - Kids Britannica Kids Homework HelpA chemical element is a basic substance. It cannot be broken down into simpler substances. Chemical elements are the building blocks for all matter that is, everything that takes up space in the universe. They are sometimes just called elements.
chemical element Definition, Origins, Distribution Chemical element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed. Learn more about the origins, distribution, and characteristics of chemical elements in this article.
Encyclopædia Britannica, Inc. The metal thallium is a poisonous chemical element with limited commercial value. Freshly cut thallium has a metallic luster that dulls to bluish gray upon contact with air. Named for the prominent green line in its spectrum, it was discovered in 1861 by Sir William Crookes. It was used as a rodenticide and insecticide until 1960s, when it was replaced.