In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table, but the f-block columns (between groups 2 and 3) are not numbered. The elements in a group have similar physical or chemical characteristics of the outermost electron shells of their atoms (i.e., the same core charge), as most chemical properties are dominated by the orbital location of the outermost electron.
There are three systems of group numbering. The modern numbering group 1 to group 18 is recommended by the International Union of Pure and Applied Chemistry (IUPAC). It replaces two older naming schemes that were mutually confusing. Also, groups may be identified by their topmost element or have a specific name. For example, group 16 is variously described as oxygen group and chalcogen.
CAS and old IUPAC numbering
Two earlier group number systems exist: CAS (Chemical Abstracts Service) and old IUPAC. Both use numerals (Arabic or Roman) and letters A and B. Both systems agree on the numbers. The numbers indicate approximately the highest oxidation number of the elements in that group, and so indicate similar chemistry with other elements with the same numeral. The number proceeds in a linearly increasing fashion for the most part, once on the left of the table, and once on the right (see List of oxidation states of the elements), with some irregularities in the transition metals. However, the two systems use the letters differently. For example, potassium (K) has one valence electron. Therefore, it is located in group 1. Calcium (Ca) is in group 2, for it contains two valence electrons.
In shooting, a shot grouping, or simply grouping, is the placement of multiple shots on a target, the shots taken in one shooting session. The closeness of the grouping, the nearness of all the shots to each other, is a measure of the accuracy of a weapon, and a measure of the shooter's consistency and skill.
Uses of the term
For firearms that shoot one round at a time, a shot grouping can be used to measure the accuracy of the system comprised out of weapon as well as the precision and uniformity of the ammunition by fixing the weapon into position on a test mount, and aiming it at a target. Multiple shots using rounds from same type and batch are fired to observe how the weapon groups the shots. If a person holds the weapon and shoots it, the grouping measures the combination of the person's skill and the weapon's accuracy.
In shotgun shooting, the grouping is also called the pattern. The pattern is the spread of shot from a single shotgun shell, measured as the smallest circle containing all the shots on the target. The barrel of a shotgun is designed to deliver a wide or narrow grouping, depending on the expected use. Shooting at close range indicates a cylinder bore barrel to deliver a wide grouping, while for hunting at longer distances such as 50 yards or meters, a choke is recommended for a tighter grouping.
It follows on the success of the Group’s Bitcoin product (BTCE), which reached over $1 billion in assets in just seven months since listing, proving the growing demand for products that enable investors to dabble in cryptocurrencies minus the safety and regulatory concerns ... Meanwhile, the Litecoin product is the third crypto ETC from ETP Group.
A report unveiled this news on April 12, noting that the ETP is dubbed ETCGroupPhysical Litecoin ETC (LTCetc) and will trade under the ticker symbol ELTC ... Per the publication, ETC Group believes that institutional investors are attracted to crypto products that are secure, liquid, and central counterparty cleared.
REVGroup, Inc ... REVG), a manufacturer of industry-leading specialty vehicles, will host its 2021 Investor and Analyst Day virtually on April 15, 2021 with presentations from Rod Rushing, President and CEO, Mark Skonieczny, CFO and other members of its executive team ... A supplemental slide deck will be available on the REV Group, Inc ... About REV Group.
NEW YORK, April 13, 2021 /PRNewswire/ -- Bernstein Liebhard, a nationally acclaimed investor rights law firm, reminds investors of the deadline to file a lead plaintiff motion in a securities class action lawsuit that has been filed on behalf of investors who purchased or acquired the securities of WorkhorseGroup, Inc.
Younger investors, particularly millennials, represent the fastest-growing demographic group among retail investors ...Baby boomers remain the largest investor group, making up 54% of the total assets among all investing households ... For mutual funds investors, lower-cost ...
CooperGroupInc ... A copy of the press release and investor presentation will be posted prior to the call under the investors section on Mr. Cooper Group’s website, www.mrcoopergroup.com ... A simultaneous audio webcast of the conference call will be available under the investors section on www.mrcoopergroup.com ... Investors section of www.mrcoopergroup.com.
(Bloomberg) — Online travel platform Trip.com GroupLtd. is telling prospective investors it plans to price its Hong Kong second listing at HK$268 ($34.4) per share, on track to raise about $1.09 billion, according to people familiar with the matter ... It has set a maximum price of HK$333 for the portion of the deal reserved for retail investors.
Adani Group has been one of the biggest beneficiaries of the stupendous bull market in domestic equities since April last year, but the real surge in the group’s wealth has come at the turn of the year as investors flocked to stocks that were perceived to be beneficiaries of the expected revival in economic growth.
... group with an established track record in investment banking, asset management, and capital formation services that utilizes the latest FinTech and RegTech innovation to provide sophisticated debt, equity, and investment products to lower middle market companies and investors.
BOSTON/NEW YORK (Reuters) – China’s regulatory-imposed revamp of Jack Ma’s Ant Group, transforming the hot fintech into a financial holding company, appears to have dented some investor appetite for any plans to revive what would have been the world’s biggest IPO.
BOSTON/NEW YORK (Reuters) -China’s regulatory-imposed revamp of Jack Ma’s Ant Group, transforming the hot fintech into a financial holding company, appears to have dented some investor appetite for any plans to revive what would have been the world’s biggest IPO.
NEW YORK, April 13, 2021 /PRNewswire/ -- Pomerantz LLP is investigating claims on behalf of investors of Aquestive Therapeutics, Inc ... Aquestive advised investors that "[i]n the CRL, the FDA cited that, in a study submitted by the Company with the NDA, certain weight groups showed a lower drug exposure level than desired ...WKHS INVESTOR NOTICE.