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atomic number

   Also found in: Medical, Legal, Financial, Acronyms, Encyclopedia, Wikipedia 0.01 sec.
atomic number
n. Symbol Z Abbr. at. no.
The number of protons in an atomic nucleus.

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

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, and is usually denoted by the letter Z and written as a subscript before an element's symbol, as in 92U.
ThesaurusLegend:  Synonyms Related Words Antonyms
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
atomic number n (Chem) → numero atomico


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Hydrogen (H), for example, has an atomic number of 1 and is the lightest known natural element on Earth.
Fusion elements at the centre have already shown the existence of elements with the atomic numbers 107-111.
Their atomic numbers are: H(1), He(2), Li(3), Be(4), B(5), C(6), N(7), O(8), F(9), Ne(10), Na(11), Mg(12), Al(13), Si(14), P(15), S(16), Cl(17), Ar(18), K(19), Ca(20), Sc(21), Ti(22), V(23), Cr(24), Mn(25), Fe(26).
 
 
 
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