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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-greater 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 as of yet insufficient quantities of them have 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 |
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Chemical series of the periodic table |
The periodic table of the chemical elements is a tabular method of displaying the chemical elements.
Although precursors to this table exist, its invention is generally credited to Russian chemist Dmitri Mendeleev in 1869.
Mendeleev intended the table to illustrate recurring ('periodic') trends in the properties of the elements.
The layout of the table has been refined and extended over time, as new elements have been discovered, and new theoretical models have been developed to explain chemical behavior.
The periodic table is now ubiquitous within the academic discipline of chemistry, providing an extremely useful framework to classify, systematize and compare all the many different forms of chemical behavior.
The table has also found wide application in physics, biology, engineering, and industry. The current standard table contains 117 confirmed elements as of October 16, 2006 (while element 118 has been synthesized, element 117 has not).
- Arrangement
- Periodicity of chemical properties
- Structure of the periodic table
- History of the periodic table
- A list of who discovered each element
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