atomic number

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atomic number

n. Symbol Z Abbr. at. no.
The number of protons in an atomic nucleus.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

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]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

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.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations
atomové číslo
原子番号
atoomnummer
atomnummer
原子序

atomic number

n (Chem) → numero atomico
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995
References in periodicals archive ?
Later work showed that Mendeleev's arrangement resulted in elements being arranged in order of increasing atomic number. The significance of atomic numbers became evident only much later, after protons and neutrons had been discovered and their role understood.
Z=26 were assigned to the letters in each element's name, and the values in order were then mathematically manipulated (using just the +-X / and V functions) such that the calculated result was equal to the element's atomic number. Susan gave examples for the elements with atomic numbers 1-92, with six gaps for TIN, LEAD, GOLD, RADON, XENON and ZINC.
Reading left to right, the rows display elements in order of increasing atomic numbers. The columns are called groups, and strangely enough, the elements in a group behave very similarly during chemical reactions with other elements!
Designated with atomic numbers 113, 115, 117 and 118, they were all discovered more than a decade ago.
What are the chemical elements with the atomic numbers 9, 17, 35, 53 and 85 collectively known as?
These measured chains of alpha-decays produced isotopes of lighter elements with atomic numbers 115 to 103, whose registration added to the proof for the observation of element 117.
The effective atomic numbers are 11.42 and 10.48 for Cu-doped and undoped potassium borate glasses, respectively, which are higher than [Z.sub.eff] in soft tissue 7.4.
Lead and lead glasses are easily available for shielding of the gamma rays and neutrons due to high densities and atomic numbers [2].
Each Element has 2 Atomic Numbers but has the same Atomic Mass.
Elements are arranged by their atomic numbers in ascending order.