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It is more pronounced than the lanthanide contraction because the 5f electrons are less effective at shielding than 4f electrons. [1] It is caused by the poor shielding effect of nuclear charge by the 5f electrons along with the expected periodic trend of increasing electronegativity and nuclear charge on moving from left to right.
Simplification is the process of replacing a mathematical expression by an equivalent one that is simpler (usually shorter), according to a well-founded ordering. Examples include:
The corresponding indole core analogue, 4F-MDMB-BICA (4F-MDMB-BUTICA), has also been widely sold as a designer drug by chemical providers on the internet, first being identified in May 2020. [9] 4F-MDMB-BINACA may be confused with a positional isomer of 5F-MDMB-PINACA called 5F-MDMB-BINACA, because of the use of the confusing names 5F-ADB and ...
Following the usual physical interpretation, we interpret the function argument t as time, and f β (t) is the differential distribution.The area under the curve can thus be interpreted as a mean relaxation time.
The Chebyshev polynomials can also be defined as the solutions to the Pell equation: () = in a ring R[x]. [6] Thus, they can be generated by the standard technique for Pell equations of taking powers of a fundamental solution: T n ( x ) + U n − 1 ( x ) x 2 − 1 = ( x + x 2 − 1 ) n . {\displaystyle T_{n}(x)+U_{n-1}(x)\,{\sqrt {x^{2}-1 ...
hexasilane Si 6 H 14 or H 3 Si−SiH 2 −SiH 2 −SiH 2 −SiH 2 −SiH 3, 6 silicon atoms and 14 hydrogen atoms, analogous to hexane; Silanes are named by adding the suffix-silane to the appropriate numerical multiplier prefix. Hence, disilane, Si 2 H 6; trisilane Si 3 H 8; tetrasilane Si 4 H 10; pentasilane Si 5 H 12; etc.
4F correlator, in Fourier optics; The 4f electron shell; Section 4(f) of the United States DOT act of 1966, which regulates acquiring park and historic properties for transportation use. 4F case, a 4 February 2006 controversial criminal case in Barcelona; Flottille 4F a French naval aviation squadron; LMS Fowler Class 4F, a class of 0-6-0 steam ...
An assortment of several designer drugs. Designer drugs are structural or functional analogues of controlled substances that are designed to mimic the pharmacological effects of the parent drug while avoiding detection or classification as illegal.