The meaning of ATOMIC NUMBER is an experimentally determined number characteristic of a chemical element that represents the number of protons in the nucleus which in a neutral atom equals the number of electrons outside the nucleus and that determines t
An atom's electrons are found in orbitals around the nucleus. The atomic number definition is based on the number of protons in an atom. Protons are positively charged particles in the nucleus of atoms. The atomic number is based solely on the number of protons in an atom. In contrast, ...
number 2 of 2verb numbered;numbering-b(ə-)riŋ 1 :countentry1sense 1a,enumerate 2 :to claim as part of a total:include wasnumberedamong the guests 3 :to restrict to a definite number vacation days arenumberednow 4 :to assign a number to ...
Noun1.atomic number 111- a radioactive transuranic element element 111,Rg,roentgenium chemical element,element- any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter ...
Atomic number definition: the number of positive charges or protons in the nucleus of an atom of a given element, and therefore also the number of electrons normally surrounding the nucleus. Abbreviation: at. no.; Symbol. See examples of ATOMIC NUMBER us
atomic number 10- a colorless odorless gaseous element that give a red glow in a vacuum tube; one of the six inert gasses; occurs in the air in small amounts Ne,neon chemical element,element- any of the more than 100 known substances (of which 92 occur naturally) that cannot be separat...
Atomic number, the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus. Accordingly, the number of protons, which is always equal to the number of electrons in a n
from the Oxford Advanced Learner's Dictionary atomic number noun /əˌtɒmɪk ˈnʌmbə(r)/ /əˌtɑːmɪk ˈnʌmbər/ (chemistry) the number of protons in the nucleus (= centre) of an atom of a particular chemical element. Elements are placed in the per...
Atomic mass unit (AMU), in physics and chemistry, a unit for expressing masses of atoms, molecules, or subatomic particles. An atomic mass unit is equal to 1 12 the mass of a single atom of carbon-12, the most abundant isotope of carbon, or 1.660538921
Theatomic numberofhydrogenis 1; the atomic number ofcarbonis 6, and the atomic number of silver is 47: any atom with 47 protons is an atom of silver. Varying the number of neutrons in an element changes its isotopes while changing the numbers of electrons makes it an ion. ...