Neptunium is the first transuranic element.Plutonium is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized.Americium is a transuranic member of the actinide series, in the periodic table located under the lanthanide element europium, and thus by analogy was named after the Americas.Curium is a hard, dense, silvery metal with a relatively high melting point and boiling point for an actinide.Berkelium is a member of the actinide and transuranium element series.Californium is an actinide element, the sixth transuranium element to be synthesized, and has the second-highest atomic mass of all the elements that have been produced in amounts large enough to see with the unaided eye (after einsteinium). ? At 0.099%, phosphorus is the most abundant pnictogen in the Earth’s crust.Sulfur is abundant, multivalent, and nonmetallic. Natural boron consists primarily of two stable isotopes, 11B (80.1%) and 10B (19.9%). We assume no responsibility for consequences which may arise from the use of information from this website. Caesium has physical and chemical properties similar to those of rubidium and potassium.Barium is the fifth element in group 2 and is a soft, silvery alkaline earth metal. It is a group of atomic orbitals with the same value of the principal quantum number \(n\). Major advantage of lead shield is in its compactness due to its higher density. Antimony compounds have been known since ancient times and were powdered for use as medicine and cosmetics, often known by the Arabic name, kohl.Tellurium is a brittle, mildly toxic, rare, silver-white metalloid. The alkali metals or group 1 elements (lithium, sodium, potassium, rubidium, cesium, francium) will have one valence electrons, so they all will have similar properties. The modern statement of this relationship, the Figure 2. Two elements that have properties similar to those of the element sodium are Potassium (K) and Lithium (Li) because they are in the same group. Argon is mostly used as an inert shielding gas in welding and other high-temperature industrial processes where ordinarily unreactive substances become reactive; for example, an argon atmosphere is used in graphite electric furnaces to prevent the graphite from burning.Potassium was first isolated from potash, the ashes of plants, from which its name derives. 'stone') is a chemical element with the symbol Li and atomic number 3. The have the same no. Both are used for tissues, but only lipids are used for tissue growth. Lithium and potassium have similar chemical properties because the atoms of both elements have the same Adopted or used LibreTexts for your course? One such grouping includes lithium (Li), sodium (Na), and potassium (K): These elements all are shiny, conduct heat and electricity well, and have similar chemical properties. The metal is produced by the electrolysis of molten lithium chloride and potassium chloride. al. (credit a: modification of work by Serge Lachinov; credit b: modification of work by “Den fjättrade ankan”/Wikimedia Commons)By the twentieth century, it became apparent that the periodic relationship involved atomic numbers rather than atomic masses. [ "article:topic", "showtoc:no", "license:ccbyncsa" ][ "article:topic", "showtoc:no", "license:ccbyncsa" ] All of its isotopes are radioactive. Mercury is a heavy, silvery d-block element, mercury is the only metallic element that is liquid at standard conditions for temperature and pressure.Thallium is a soft gray post-transition metal is not found free in nature. The reaction of potassium with water gives a lilac flame Atoms of the group 1 elements all have one electron in their outer shell. In fact their absorption cross-sections are the highest among all stable isotopes.Terbium is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife. Remember that we saw that carbon and nitrogen have very similar atomic masses. These elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare earth elements.Discoverer: Coster, Dirk & De Hevesy, George CharlesDiscoverer: Noddack, Walter & Berg, Otto Carl & Tacke, IdaThe actinide or actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium.Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. Lead is soft and malleable, and is solid under standard conditions, atoms! Average energy and travel farther from the nucleus than those in inner shells of pure copper has reddish-orange! 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