atomic number


Also found in: Thesaurus, Medical, Legal, Financial, Acronyms, Encyclopedia, Wikipedia.
Related to atomic number: Isotopes, atomic weight

atomic number

n. Symbol Z Abbr. at. no.
The number of protons in an atomic nucleus.

atomic number

n
(General Physics) the number of protons in the nucleus of an atom of an element. Abbreviation: at. no. Symbol: Z Also called: proton number

atom′ic num′ber


n.
the number of protons in the nucleus of an atom of a given element, used to locate the element in the periodic table. Abbr.: at. no.; Symbol: Z
[1815–25]

atomic number

The number of protons in the nucleus of an atom. In electrically neutral atoms, this number is also equal to the number of electrons orbiting about the atom's nucleus. The atomic number of an element determines its position in the Periodic Table.

atomic number

1. Or proton number (Z) The number of protons in the nucleus of an atom. If not electrically charged, this is equal to the number of electrons in its shells.
2. The number of protons in the nucleus of an atom.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.atomic number - the order of an element in Mendeleyev's table of the elementsatomic number - the order of an element in Mendeleyev's table of the elements; equal to the number of protons in the nucleus or electrons in the neutral state of an atom of an element
number - a concept of quantity involving zero and units; "every number has a unique position in the sequence"
magic number - the atomic number of an extra stable strongly bound atomic nucleus: 2, 8, 20, 28, 50, 82 or 126
Translations
atomové číslo
原子番号
atoomnummer
atomnummer
原子序

atomic number

n (Chem) → numero atomico
References in periodicals archive ?
Based solely on lawrencium's atomic number, chemists expect that its outermost electrons will be in 5f, 6d and 7s orbitals.
This results in those rare earths with lower atomic numbers and atomic weights actually having larger atoms than elements that are higher in the periodic table.
According to the table, the most long-lived isotope of an element violates the strict law of increase in mass number with increase in atomic number. To check the validity of element No.
Indeed, new work by Nicolas Dauphas (University of Chicago) uses thorium and uranium (atomic number 92) to place the halo's age between 12.3 and 17.3 billion years.
After he had finished looking at this particular issue, he came to me and said, "Mommy, let's see if you can guess the atomic numbers of the elements.
The evaluation of the residual errors was usually done for the combined effects of atomic number, absorption and fluorescence, but obviously the tests for each of the corrections should be done separately for each effect.
PIXE results on the fillers show that for carbon black the sample is 99.6% low atomic number elements, presumably carbon, hydrogen and oxygen.
What is the lightest of all the elements and has the atomic number 1?
Googling a runner Radium 2.25 Ascot Identified by the chemical symbol Ra and an atomic number of 88, Radium is radioactive and almost pure white, but readily oxidises on exposure to air and turns black.
At the 42nd General Assembly in Ottawa, ON, the International Union of Pure and Applied Chemistry (IUPAC) Council officially approved the name for the element of atomic number 110, to be known as darmstadtium.