Group 10 element

Group 10 in the periodic table
group 9 ←    → group 11
IUPAC group number 10 Name by element nickel group CAS group number (US, pattern A-B-A) part of VIIIB old IUPAC number (Europe, pattern A-B) part of VIII
↓ Period
4	Nickel (Ni) 28 Transition metal
5	Palladium (Pd) 46 Transition metal
6	Platinum (Pt) 78 Transition metal
7	Darmstadtium (Ds) 110 unknown chemical properties
Legend primordial element synthetic element Atomic number color: black=solid

Group 10, numbered by current IUPAC style, is the group of chemical elements in the periodic table that consists of nickel (Ni), palladium (Pd), platinum (Pt), and perhaps also the chemically uncharacterized darmstadtium (Ds). All are d-block transition metals. All known isotopes of darmstadtium are radioactive with short half-lives, and are not known to occur in nature; only minute quantities have been synthesized in laboratories.

Like other groups, the members of this group show patterns in electron configuration, especially in the outermost shells, although for this group they are particularly weak, with palladium being an exceptional case. The relativistic stabilization of the 7s orbital is the explanation to the predicted electron configuration of darmstadtium, which, unusually for this group, conforms to that predicted by the Aufbau principle.

Chemistry

Z	Element	No. of electrons per shell
28	nickel	2, 8, 16, 2
46	palladium	2, 8, 18, 18
78	platinum	2, 8, 18, 32, 17, 1
110	darmstadtium	2, 8, 18, 32, 32, 16, 2 (predicted)

Darmstadtium has not been isolated in pure form, and its properties have not been conclusively observed; only nickel, palladium, and platinum have had their properties experimentally confirmed. All three elements are typical silvery-white transition metals, hard, and refractory, with high melting and boiling points.

Properties

Group 10 metals are white to light grey in color, and possess a high luster, a resistance to tarnish (oxidation) at STP, are highly ductile, and enter into oxidation states of +2 and +4, with +1 being seen in special conditions. The existence of a +3 state is debated, as the state could be an illusory state created by +2 and +4 states. Theory suggests that group 10 metals may produce a +6 oxidation state under precise conditions, but this remains to be proven conclusively in the laboratory other than for platinum.

Applications

The group 10 metals share several uses. These include:

• Decorative purposes, in the form of jewelry and electroplating.
• Catalysts in a variety of chemical reactions.
• Metal alloys.
• Electrical components, due to their predictable changes in electrical resistivity with regard to temperature.
• Superconductors, as components in alloys with other metals.

Biological role and toxicity

Nickel has an important role in the biochemistry of organisms, as part of the active center of enzymes. None of the other group 10 elements have a known biological role, but platinum compounds have widely been used as anticancer drugs. Aside from nickel, the elements are toxic for organisms.

See also

• Platinum group

Notes and references