Group 4 is a group of elements in the periodic table.
PGC lectures : Group IVA Elements
It contains the elements titanium Ti , zirconium Zr , hafnium Hf and rutherfordium Rf. This group lies in the d-block of the periodic table. The group itself has not acquired a trivial name ; it belongs to the broader grouping of the transition metals. The three group 4 elements that occur naturally are titanium, zirconium and hafnium.
The first three members of the group share similar properties; all three are hard refractory metals under standard conditions.
However, the fourth element rutherfordium Rf , has been synthesized in the laboratory; none of its isotopes have been found occurring in nature. All isotopes of rutherfordium are radioactive. So far, no experiments in a supercollider have been conducted to synthesize the next member of the group, either unpenthexium Uph, element or unpentoctium Upo, element , and it is unlikely that they will be synthesized in the near future.
Like other groups, the members of this family show patterns in its electron configuration, especially the outermost shells resulting in trends in chemical behavior:. Most of the chemistry has been observed only for the first three members of the group.
The chemistry of rutherfordium is not very established and therefore the rest of the section deals only with titanium, zirconium, and hafnium. The reactivity is not always obvious due to the rapid formation of a stable oxide layer, which prevents further reactions. For the first three metals, it has been shown that they are resistant to concentrated alkalis , but halogens react with them to form tetrahalides.
At higher temperatures, all three metals react with oxygen , nitrogen , carbon , boron , sulfur , and silicon. Because of the lanthanide contraction of the elements in the fifth period , zirconium and hafnium have nearly identical ionic radii.
This similarity results in nearly identical chemical behavior and in the formation of similar chemical compounds. The melting points and boiling points of the compounds and the solubility in solvents are the major differences in the chemistry of these twin elements.
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The table below is a summary of the key physical properties of the group 4 elements. The four question-marked values are extrapolated. British mineralogist William Gregor first identified titanium in ilmenite sand beside a stream in Cornwall , Great Britain in the year In , chemist Martin Heinrich Klaproth independently rediscovered the metal oxide in rutile from the Hungarian village Boinik.
Martin Heinrich Klaproth discovered zirconium when analyzing the zircon containing mineral jargoon in He deduced that the mineral contained a new element and named it after the already known Zirkonerde zirconia.
Cornish chemist Humphry Davy also attempted to isolate this new element in through electrolysis , but failed. Hafnium had been predicted by Dmitri Mendeleev in and Henry Moseley measured in the effective nuclear charge by X-ray spectroscopy to be 72, placing it between the already known elements lutetium and tantalum.
Dirk Coster and Georg von Hevesy were the first to search for the new element in zirconium ores. This was only partly due to hafnium's relative scarcity. The chemical similarity between zirconium and hafnium made a separation difficult and, without knowing what to look for, hafnium was left undiscovered, although all samples of zirconium, and all of its compounds, used by chemists for over two centuries contained significant amounts of hafnium.
Researchers there bombarded Pu with accelerated 22 Ne ions and separated the reaction products by gradient thermochromatography after conversion to chlorides by interaction with ZrCl 4.
The production of the metals itself is difficult due to their reactivity. The formation of oxides , nitrides and carbides must be avoided to yield workable metals; this is normally achieved by the Kroll process.
The oxides MO 2 are reacted with coal and chlorine to form the chlorides MCl 4. The chlorides of the metals are then reacted with magnesium, yielding magnesium chloride and the metals. Further purification is done by a chemical transport reaction developed by Anton Eduard van Arkel and Jan Hendrik de Boer.
The metal forms a solid coating on the tungsten filament and the iodine can react with additional metal resulting in a steady turnover.
If the abundance of elements in Earth's crust is compared for titanium, zirconium and hafnium, the abundance decreases with increase of atomic mass.
All three stable elements occur in heavy mineral sands ore deposits , which are placer deposits formed, most usually in beach environments, by concentration due to the specific gravity of the mineral grains of erosion material from mafic and ultramafic rock. The titanium minerals are mostly anatase and rutile , and zirconium occurs in the mineral zircon. The largest producers of the group 4 elements are Australia , South Africa and Canada.
Titanium metal and its alloys have a wide range of applications, where the corrosion resistance, the heat stability and the low density light weight are of benefit. The foremost use of corrosion-resistant hafnium and zirconium has been in nuclear reactors. Zirconium has a very low and hafnium has a high thermal neutron-capture cross-section.
Therefore, zirconium mostly as zircaloy is used as cladding of fuel rods in nuclear reactors ,  while hafnium is used in control rod s for nuclear reactors , because each hafnium atom can absorb multiple neutrons. Smaller amounts of hafnium  and zirconium are used in super alloys to improve the properties of those alloys.
The group 4 elements are not known to be involved in the biological chemistry of any living systems. Titanium is one of the few first row d-block transition metals with no known biological role. Rutherfordium's radioactivity would make it toxic to living cells. Titanium is non-toxic even in large doses and does not play any natural role inside the human body.
Group iv elements pdf files
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Bibcode : JChEd Nature's Building Blocks.
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LCCCN Part II: Introduction to discovery profiles. Part III: Discovery profiles of the transfermium elements".
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Physical Properties of Group IV Elements
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Group 4 element
Periodic table. Alternatives Janet's left step table. Lists of metalloids by source Dividing line. Reactive nonmetals Noble gases. Crystal structure Electron configuration Electronegativity Goldschmidt classification Term symbol.
Element discoveries Mendeleev's predictions Naming etymology controversies for places for people in East Asia. Book Category.
Group 4 elements. Authority control GND : Categories : Groups periodic table.