The trivial name poor metals is sometimes applied to the metallic elements in the p-block of the periodic table. Their melting and boiling points are generally lower than those of the transition metals and their electronegativity higher, and they are also softer. They are distinguished from the metalloids, however, by their significantly higher boiling points in the same row.
"Poor metals" is not a rigorous IUPAC-approved nomenclature, but the grouping is generally taken to include aluminium, gallium, indium, tin, thallium, lead, and bismuth. Occasionally germanium, antimony, and polonium are also included, although these are usually considered to be metalloids or "semi-metals". Elements 113 to 116, which are currently allocated the systematic names ununtrium, ununquadium, ununpentium and ununhexium, would likely exhibit properties characteristic of poor metals; however sufficient quantities of them have not yet been synthesized to examine their chemical properties.
| 13 | 14 | 15 | 16 | 17 |
|---|---|---|---|---|
| B Boron |
C Carbon |
N Nitrogen |
O Oxygen |
F Fluorine |
| Al Aluminium |
Si Silicon |
P Phosphorus |
S Sulfur |
Cl Chlorine |
| Ga Gallium |
Ge Germanium |
As Arsenic |
Se Selenium |
Br Bromine |
| In Indium |
Sn Tin |
Sb Antimony |
Te Tellurium |
I Iodine |
| Tl Thallium |
Pb Lead |
Bi Bismuth |
Po Polonium |
At Astatine |
See also
editReferences
edit- The Chemistry Student's Companion, Stephen Schaffter, Lulu Press, Inc 2006 ISBN 1-4116-9247-0
External links
edit
af:Hoofgroepmetale ar:فلز ضعيف ast:Metal del bloque p ca:Metall del bloc p es:Metal del bloque p eo:Posttransira metalo eu:Metal txiro fr:Métal pauvre ko:전이후 금속 id:Logam miskin is:Tregur málmur it:Metalli del blocco p he:מתכות מעבר עמידות lmo:Metàj del blòch p nl:Hoofdgroepmetaal ja:卑金属 sv:Övrig metall ta:குறை மாழை th:โลหะหลังทรานซิชัน tr:Zayıf metaller zh:贫金属