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A mnemonic is a memory aid used to improve long-term memory and make the process of consolidation easier. Many chemistry aspects, rules, names of compounds, sequences of elements, their reactivity, etc., can be easily and efficiently memorized with the help of mnemonics.
Computation chemists see the split as a change of the second quantum number l from 1 to 1 ⁄ 2 and 3 ⁄ 2 for the more stabilized and less stabilized parts of the 7p subshell, respectively: the 7p 1/2 subshell acts as a second inert pair, though not as inert as the 7s electrons, while the 7p 3/2 subshell can easily participate in chemistry.
Powell P & Timms PL 1974, The Chemistry of the Non-metals, Chapman & Hall, London, ISBN 978-0-470-69570-8. Twenty-two nonmetals including B, Si, Ge, As and Te. Tin and antimony are shown as being intermediate between metals and nonmetals; they are later shown as either metals or nonmetals. Astatine is counted as a metal.
In chemistry, a reactivity series (or reactivity series of elements) is an empirical, ... electronegative metals with values between 1.9 and 2.54.
Most of the chemistry has been observed only for the first three members of the group; chemical properties of lawrencium are not well-characterized, but what is known and predicted matches its position as a heavier homolog of lutetium. The remaining elements of the group (scandium, yttrium, lutetium) are quite electropositive.
The first three elements are hard silvery-white metals: Cobalt is a metallic element that can be used to turn glass a deep blue color. Cobalt is primarily used in lithium-ion batteries , and in the manufacture of magnetic , wear-resistant and high-strength alloys .
Hence, in many cases the elements of a particular group have the same valency. However, this periodic trend is not always followed for heavier elements, especially for the f-block and the transition metals. These elements show variable valency as these elements have a d-orbital as the penultimate orbital and an s-orbital as the outermost orbital.
The chemical elements can be broadly divided into metals, metalloids, and nonmetals according to their shared physical and chemical properties.All elemental metals have a shiny appearance (at least when freshly polished); are good conductors of heat and electricity; form alloys with other metallic elements; and have at least one basic oxide.