Sr…These metals display only one stable oxidation state. Li and Ba) and/or occur as minor but useful contaminants in Ca bio-minerals e.g. Some…other s-block elements are used in medicine (e.g. …Na, K, Mg and Ca are essential in biological systems. Helium is an s-block element, with its outer (and only) electrons in the 1s atomic orbital, although its chemical properties are more similar to the p-block noble gases in group 18 due to its full shell. Groups (columns) in the f-block (between groups 2 and 3) are not numbered. However, they remain d-block elements even when considered to be main group. The group 3 elements are occasionally considered main group elements due to their similarities to the s-block elements. 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 s-block and p-block together are usually considered main-group elements, the d-block corresponds to the transition metals, and the f-block corresponds to the inner transition metals and encompasses nearly all of the lanthanides (like lanthanum) and the actinides (like actinium). There is an approximate correspondence between this nomenclature of blocks, based on electronic configuration, and sets of elements based on chemical properties. Useful statements about the elements can be made on the basis of the block they belong to and their position in it, for example highest oxidation state, density, melting point… Electronegativity is rather systematically distributed across and between blocks. In collaboration with her colleagues, she has contributed two new types of zeolite frameworks coded as RRO and PUN among the total number of 246 (up to July 2022).The division into blocks is justified by their distinctive nature: s is characterized, except in H and He, by highly electropositive metals p by a range of very distinctive metals and non-metals, many of them essential to life d by metals with multiple oxidation states f by metals so similar that their separation is problematic. She has published more than 100 peer-review papers in studying inorganic solids especially porous materials and complex oxides. She joined PKU in July 1988 and now is a Professor in the Colleague of Chemistry & Molecular Engineering. Ying-Xia Wang obtained her BSc (1985), MSc (1988) and PhD (1997) degrees from Peking University (PKU), and carried out postdoctoral research at Ruhr-University Bochum in 2001-2003. He has published over 100 research papers, together with over a dozen Chinese chemistry textbooks and reference books. His research interests lie in X-ray crystallography and structural chemistry. He then joined the Chemistry Department of Peking University and taught structural chemistry there until his retirement as a Professor in 1992. Gong-Du Zhou graduated with a BSc degree from Xichuan University in 1953 and completed his postgraduate studies at Peking University in 1957. He is currently engaged in undergraduate teaching and supervision of practical physical chemistry. He joined the Chemistry Department of CUHK as a Lecturer in 1999 and gained promotion to Senior Lecturer in 2017. Yu-San Cheung obtained his BSc (1992) and MPhil (1994) degrees from CUHK and his Ph.D. He was elected as Member of Chinese Academy of Sciences in 2001, and has over 1150 international journal publications recorded in with a h-index of 76. After successive stints as NASA Research Associate at University of Pittsburgh and Assistant Professor of Chemistry at University of Western Ontario, he returned home in 1969 to join CUHK, where he is now Emeritus Professor and Wei Lun Research Professor. Thomas Chung Wai Mak matriculated at Wah Yan College Hong Kong in 1957 and obtained BSc (1st Class Hon Chem & Phys 1960) and PhD (Chem 1963)ĭegrees from University of British Columbia. Thomas CW Mak, Emeritus Professor and Wei Lun Research Professor, Department of Chemistry, The Chinese University of Hong Kong, Yu San Cheung, Senior Lecturer, Department of Chemistry, The Chinese University of Hong Kong, Yingxia Wang, Professor, College of Chemistry and Molecular Engineering, Peking University, and Gong Du Zhou, Professor, College of Chemistry and Molecular Engineering, Peking University
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |