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[https://www.iupac.org/fileadmin/user_upload/databases/Red_Book_2005.pdf Red Book (2005)] p51/pdf-p63

[https://iupac.org/what-we-do/books/redbook/]
==Red Book 2005-edited==
{{Quote
| author    =
| title     =NOMENCLATURE OF INORGANIC CHEMISTRY<br>IUPAC Recommendations 2005
| source    =[https://www.iupac.org/fileadmin/user_upload/databases/Red_Book_2005.pdf Red Book (2005)] p51/pdf-p63
| character =
| multiline =y
| style     =background:MistyRose
| quote     ='''IR-3.5: ELEMENTS IN THE PERIODIC TABLE'''<br>
The '''groups of elements''' in the periodic table (see inside front cover) are numbered from 1 to 18. The elements (except hydrogen) of groups 1, 2 and 13–18 are designated as main group elements and, except in group 18, the first two elements of each main group are termed typical elements. Optionally, the letters s, p, d and f may be used to distinguish different '''blocks of elements'''. For example, the elements of groups 3–12 are the d-block elements. These elements are also commonly referred to as the transition elements, though the elements of group 12 are not always included; the f-block elements are sometimes referred to as the inner transition elements. If appropriate for a particular purpose, the various '''groups''' may be named from the first element in each, for example elements of the boron group (B, Al, Ga, In, Tl), elements of the titanium group (Ti, Zr, Hf, Rf), ''etc''.
  
The following '''collective names for like elements''' are IUPAC-approved: alkali metals (Li, Na, K, Rb, Cs, Fr), alkaline earth metals (Be, Mg, Ca, Sr, Ba, Ra), pnictogens (N, P, As, Sb, Bi), chalcogens (O, S, Se, Te, Po), halogens (F, Cl, Br, I, At), noble gases (He, Ne, Ar, Kr, Xe, Rn), lanthanoids (La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu), rare earth metals (Sc, Y and the lanthanoids) and actinoids (Ac, Th, Pa, U, Np, Pu, Am, Cm, Bk, Cf, Es, Fm, Md, No, Lr).
  
The '''generic terms''' pnictide, chalcogenide and halogenide (or halide) are commonly used in naming compounds of the pnictogens, chalcogens and halogens. Although lanthanoid means ‘like lanthanum’ and so should not include lanthanum, lanthanum has become included by common usage. Similarly, actinoid. The ending ‘ide’ normally indicates a negative ion, and therefore lanthanoid and actinoid are preferred to lanthanide and actinide.
}}
===Notes===
* For the current topic, we ignore explicit group names ('boron group'), block names (s, p, d, f), and the generic (compound) terms. Also, we ignore issues like spelling and capitalisation (they do not alter the statements).
* IUPAC lists and names '''sets of elements''', being 'like elements'.
{{periodic table (micro)
|title="like elements" by IUPAC, labeled
|mark=
<!-- alkali metals -->Li, Na, K, Rb, Cs, Fr,
<!-- alkaline earth metals -->Be, Mg, Ca, Sr, Ba, Ra,
<!-- pnictogens -->N, P, As, Sb, Bi,
<!-- chalcogens -->O, S, Se, Te, Po,
<!-- halogens -->F, Cl, Br, I, At,
<!-- noble gases -->He, Ne, Ar, Kr, Xe, Rn,
<!-- lanthanoids -->La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu,
<!-- rare earth metals=Sc, Y, and the lanthanoids and actinoids -->Sc, Y,
<!-- actinoids -->Ac, Th, Pa, U, Np, Pu, Am, Cm, Bk, Cf, Es, Fm, Md, No, Lr,
<!-- transition elements  -->Sc,Ti,V,Cr,Mn,Fe,Co,Ni,Cu,Y,Zr,Nb,Mo,Tc,Ru,Rh,Pd,Ag,La,Hf,Ta,W,Re,Os,Ir,Pt,Au,Ac,Rf,Db,Sg,Bh,Hs,Mt,Ds,Rg,
<!-- group 12 option mentioned by IUPAC/NOT transition sometimes -->Zn, Cd, Hg, Cn,
<!-- inner transition metals=f-block skipped here -->
}}
* In this text, '''101 elements are explicitly listed''' being in a 'like elements' set. Eleven sets are named (there are overlaps).
{{clear}}
* All sets mentioned have a '''fixed list of members''' (except for the transition elements, where group 12 elements Zn, Cd, Hg, Cn may be excluded: i.e., an explicit border issue).
* IUPAC '''gives names for all 'like element' sets'''
* IUPAC '''does not define their like-ness''' (no set definition, not 'what is an alkali metal?').
* '''Not listed, not named''' sets: metals, metalloids, nonmetals. I note that these sets ''do not have a definite list of elements''. Simply by looking at the metalloids, which is clearly not a definite set [[Lists of metalloids|in literature]], introduces border issues (element inclusion yes/no?), and thereby fuzzing the borders of ''all'' the other sets (who are bordering metalloids). The non-listed like-sets are in or near the p-block.
* Also not listed, not named (subsets): post-transition metals, non-noble nonmetals, 'other nonmetals'. Here too the metalloids' border issue rules. Also not mentioned are wiki category names polyatomic nonmetal, diatomic nonmetal, less active nonmetal, active nonmetal.

==Source: IUPAC Recommendations (Red Book 2005)==
{{Quote
| author    =
| title     =NOMENCLATURE OF INORGANIC CHEMISTRY<br>IUPAC Recommendations 2005
| source    =[https://www.iupac.org/fileadmin/user_upload/databases/Red_Book_2005.pdf Red Book (2005)] p51/pdf-p63
| character =
| multiline =y
| style     =background:MistyRose
| quote     =  IR-3.5<br>
  ELEMENTS IN THE PERIODIC TABLE<br>
The groups of elements in the periodic table (see inside front cover) are numbered from 1 to 18. The elements (except hydrogen) of groups 1, 2 and 13–18 are designated as main group elements and, except in group 18, the first two elements of each main group are termed typical elements. Optionally, the letters s, p, d and f may be used to distinguish different blocks of elements. For example, the elements of groups 3–12 are the d-block elements. These elements are also commonly referred to as the transition elements, though the elements of group 12 are not always included; the f-block elements are sometimes referred to as the inner transition elements. If appropriate for a particular purpose, the various groups may be named from the first element in each, for example elements of the boron group (B, Al, Ga, In, Tl), elements of the titanium group (Ti, Zr, Hf, Rf), ''etc''.
  
The following collective names for like elements are IUPAC-approved: alkali metals (Li, Na, K, Rb, Cs, Fr), alkaline earth metals (Be, Mg, Ca, Sr, Ba, Ra), pnictogens<sup>[8]</sup> (N, P, As, Sb, Bi), chalcogens (O, S, Se, Te, Po), halogens (F, Cl, Br, I, At), noble gases (He, Ne, Ar, Kr, Xe, Rn), lanthanoids (La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu), rare earth metals (Sc, Y and the lanthanoids) and actinoids (Ac, Th, Pa, U, Np, Pu, Am, Cm, Bk, Cf, Es, Fm, Md, No, Lr).
  
The generic terms pnictide, chalcogenide and halogenide (or halide) are commonly used in naming compounds of the pnictogens, chalcogens and halogens. Although lanthanoid means ‘like lanthanum’ and so should not include lanthanum, lanthanum has become included by common usage. Similarly, actinoid. The ending ‘ide’ normally indicates a negative ion, and therefore lanthanoid and actinoid are preferred to lanthanide and actinide.
}}

==IUPAC Recommendations (Red Book 2005)==
{{Quote
| author    =
| title     =NOMENCLATURE OF INORGANIC CHEMISTRY<br>IUPAC Recommendations 2005
| source    =[https://www.iupac.org/fileadmin/user_upload/databases/Red_Book_2005.pdf Red Book (2005)] p51/pdf-p63
| character =
| multiline =y
| style     =background:MistyRose
| quote     =  IR-3.5<br>
  ELEMENTS IN THE PERIODIC TABLE<br>
The groups of elements in the periodic table (see inside front cover) are numbered from 1 to 18. The elements (except hydrogen) of groups 1, 2 and 13–18 are designated as main group elements and, except in group 18, the first two elements of each main group are termed typical elements. Optionally, the letters s, p, d and f may be used to distinguish different blocks of elements. For example, the elements of groups 3–12 are the d-block elements. These elements are also commonly referred to as the transition elements, though the elements of group 12 are not always included; the f-block elements are sometimes referred to as the inner transition elements. If appropriate for a particular purpose, the various groups may be named from the first element in each, for example elements of the boron group (B, Al, Ga, In, Tl), elements of the titanium group (Ti, Zr, Hf, Rf), ''etc''.
  
The following collective names for like elements are IUPAC-approved: alkali metals (Li, Na, K, Rb, Cs, Fr), alkaline earth metals (Be, Mg, Ca,Sr, Ba, Ra), pnictogens<sup>[8]</sup> (N, P, As, Sb, Bi), chalcogens (O, S, Se, Te, Po), halogens (F, Cl, Br, I, At), noble gases (He, Ne, Ar, Kr, Xe, Rn), lanthanoids (La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu), rare earth metals (Sc, Y and the lanthanoids)and actinoids (Ac, Th, Pa, U, Np, Pu, Am, Cm, Bk, Cf, Es, Fm, Md, No, Lr).
  
The generic terms pnictide, chalcogenide and halogenide (or halide) are commonly used in naming compounds of the pnictogens, chalcogens and halogens. Although lanthanoid means ‘like lanthanum’ and so should not include lanthanum, lanthanum has become included by common usage. Similarly, actinoid. The ending ‘ide’ normally indicates a negative ion, and therefore lanthanoid and actinoid are preferred to lanthanide and actinide.
}}