atomic number

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the order of an element in Mendeleyev's table of the elements

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The effect of background curvature is more likely to be significant for samples of high mean atomic number, since the continuum intensity is then greatest, and a given degree of curvature has a greater effect in terms of elemental concentration.
Most of the elements measured for plastics formulations have lower atomic numbers, for which the low-powered x-ray tubes do a good job," concedes Azucema Overman, product manager at Asoma Instruments.
Here, their atomic numbers are equated with the numerical positions of the 26 letters of the alphabet in order to make words.
It was established in 1913, in full conformity with the hypothesis of Van den Brook, that the atomic numbers of the chemical elements directly reflect the nuclear charge of their atoms.
He also considers Rontgen's discovery of X-rays and its consequences, including radioactivity, the determination of crystal structure, Moseley's atomic numbers, and analytical applications.
Elements have since been ordered according to their atomic numbers, or number of protons.
Since the contribution of secondary electrons is very small for electrically insolated targets of minimal size (<10 mm3) and also fairly constant over large ranges of atomic number, we established that sample biasing was unnecessary in comparing stable isotopes pairs where the atomic numbers (and hence the nuclear charges) are exactly the same.
The objective of this study is to determine the possible number of chemical elements, along with atomic masses and atomic numbers up to the final entry in the Periodic Table.
In the February 2002 issue of Word Ways my article "The Symbols of the Chemical Elements" examined the symbols for the chemical elements with atomic numbers 1 to 109.
For intermediate atomic numbers, the Cu K-range is approximately 1 [micro]m while for high atomic number elements the range decreases toward 500 nm.
In what some chemists furiously call "a surprise move," a committee of the International Union of Pure & Applied Chemistry (IUPAC) recommended renaming several "transfermium" elements, those with atomic numbers above 100.
These too can generate all the letters contained in them, and the most economical generating set I have been able to obtain (the atomic numbers are to be kept as low as possible) is <B,Fe,Br,Y,Rh, In,Sn,Ba,Er,Tb,Yb,Ra,Th> which generates <A,B,D,E,H,I,M,N,O,R,T,U,Y> as follows:
Using such a strategy, researchers have synthesized more than two dozen elements having higher atomic numbers than that of uranium, which has 92 protons in its nucleus.
Those with higher atomic numbers merit the title "transuranium" and are created by scientists using particle accelerators.