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An organizational founder is a person who has undertaken some or all of the formational work needed to create a new organization, whether it is a business, a charitable organization, a governing body, a school, a group of entertainers, or any other type of organization. If there are multiple founders, each can be referred to as a co-founder.
Another way to classify incompatible elements is by mass (lanthanide series): light rare-earth elements (LREE) are La, Ce, Pr, Nd, and Sm, and heavy rare-earth elements (HREE) are Eu–Lu. Rocks or magmas that are rich, or only slightly depleted, in light rare-earth elements are referred to as "fertile", and those with strong depletions in LREE ...
The data sampled is then stratified by age group – this means that the association between activity and infarct would be analyzed per each age group. If the different age groups (or age strata) yield much different risk ratios, age must be viewed as a confounding variable. There exist statistical tools, among them Mantel–Haenszel methods ...
In abstract algebra, a group isomorphism is a function between two groups that sets up a bijection between the elements of the groups in a way that respects the given group operations. If there exists an isomorphism between two groups, then the groups are called isomorphic .
There are only two cosets: the set of even integers and the set of odd integers, and therefore the quotient group / is the cyclic group with two elements. This quotient group is isomorphic with the set {,} with addition modulo 2; informally, it is sometimes said that / equals the set {,} with addition modulo 2.
The main group includes the elements (except hydrogen, which is sometimes not included [citation needed]) in groups 1 and 2 , and groups 13 to 18 . The s-block elements are primarily characterised by one main oxidation state, and the p-block elements, when they have multiple oxidation states, often have common oxidation states separated by two ...
In a mineral, nearly all elements distribute unevenly between the solid and liquid phase. This phenomenon known as chemical fractionation and can be described by an equilibrium constant , K {\displaystyle K} which sets a fixed distribution of an element between any two phases at equilibrium . [ 1 ]
A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...