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A101647 Atomic numbers of elements excluding metals, halogens, and noble gases in the periodic table. 5
1, 6, 7, 8, 15, 16, 34 (list; graph; refs; listen; history; text; internal format)



"Nonmetals" as normally understood in elementary chemistry.

All nonmetals are sandwiched between the halogens and metalloids on the periodic table, with the exception of hydrogen, which is on the same group as the alkali metals. - Happelberg

There may appear to be some disagreement in regards to the definition of nonmetals. This sequence appears on the cover of the Halka and Nordstrom book on nonmetals, and that book has eight chapters, the first seven of which are each devoted to an element identified by this sequence.

The Baldwin book, on the other hand, flatly declares "All elements to the right of the stepped line [on the periodic table shown in that book] are nonmetals," meaning that the author also considers halogens and noble gases to be nonmetals.

But then there is the Halka and Nordstrom book on halogens and noble gases, which says "The halogens ... are nonmetals, but have such special properties that they are given their own classification. The same is true for the noble gases." - Alonso del Arte, Apr 26 2011


Carol Baldwin, Nonmetals. Raintree (2006) p. 13

Monica Halka and Brian Nordstrom, Halogens and Noble Gases, Facts On File (2010), p. xiii

Monica Halka and Brian Nordstrom, Nonmetals, Facts On File (2010)

The New Encyclopaedia Britannica, 15th Edition, 1991, Volume 15 (Macropedia), Chemical Elements.


Table of n, a(n) for n=1..7.

Yinon Benton, Periodic Table: Non-Metals, from ChemicalElements.com.

Bodner Research Web, The Chemistry Of Nonmetals, from the Purdue University College of Science.

Wikipedia, Nonmetals.


Carbon is a nonmetal, and its atomic number is 6.


Cf. A099955 (alkali metals), A099956 (alkaline earth metals), A101648 (metalloids), A097478 (halogens), A018227 (noble gases), A101649 (poor metals).

Sequence in context: A146329 A272344 A133893 * A155150 A078745 A087663

Adjacent sequences:  A101644 A101645 A101646 * A101648 A101649 A101650




Robert Happelberg (roberthappelberg(AT)yahoo.com), Dec 10 2004



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Last modified June 21 06:55 EDT 2021. Contains 345358 sequences. (Running on oeis4.)