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The group 12 elements have multiple effects on biological organisms as cadmium and mercury are toxic while zinc is required by most plants and animals in trace amounts. Zinc is an essential trace element , necessary for plants, [ 111 ] animals, [ 112 ] and microorganisms . [ 113 ]
Group: group 12: Period: period 6: Block ... Mercury is a chemical element; ... A 2001 study measured mercury levels in 12 indoor sites chosen to represent a cross ...
Group 12 elements are often considered to be transition metals; however, zinc (Zn), cadmium (Cd), and mercury (Hg) share some properties of both groups, and some scientists believe they should be included in the main group. [1] [2]
Group 12 elements. 5 articles. Zinc ... Mercury Copernicium. This page was last edited on 5 August 2024, at 17:57 (UTC). Text is available under the Creative Commons ...
On the group 12 metals (zinc, cadmium and mercury), Smith [48] observed that, "Textbook writers have always found difficulty in dealing with these elements." There is an abrupt and significant reduction in physical metallic character from group 11 to group 12. [49] Their chemistry is that of main group elements. [50]
The group 12 elements zinc, cadmium, and mercury are sometimes regarded as main group, rather than transition group, because they are chemically and physically more similar to the p-block elements than the other d-block elements. The group 3 elements are occasionally considered main group elements due to their similarities to the s-block ...
However the group 12 metals have much lower melting and boiling points since their full d subshells prevent d–d bonding, which again tends to differentiate them from the accepted transition metals. Mercury has a melting point of −38.83 °C (−37.89 °F) and is a liquid at room temperature.
Mercury is unique among the group 12 metals for its ability to form the M–M bond so readily. Hg 2 Cl 2 is a linear molecule. The mineral calomel crystallizes in the tetragonal system, with space group I4/m 2/m 2/m. The unit cell of the crystal structure is shown below: