![]() ![]() metals (including alkaline metals, alkaline earth metals, p-block metals, transition metals),.How many elements are included in Mendeleev’s periodic table in the 21 st century? Presently the periodic table consists of 118 elements, which are classified into the following groups: It was a descriptive table of the elements, simple in form and including several dozen elements. The first Mendeleev’s table did not resemble the table of chemical elements that we use today. So let’s check how to read the periodic table to acquire as much information as possible. Mendeleev’s periodic table can be seen in virtually any school chemistry lab, being the foundation of contemporary knowledge of chemistry. This was a landmark discovery that revolutionised the image of the continuously developing science of chemistry. He believed that the properties of elements in the periodic table changed along with the atomic mass, and that the neighbouring elements, arranged by the growing atomic number, indicate certain similarities. Mendeleev was the first researcher in history to discover the periodic law of elements. Mendeleev’s periodic table, as it began to be called, quickly became the key point of reference for researchers and chemists. However, only as late as in 1869 Dmitri Ivanovich Mendeleev, a Russian chemist, decided to organise the available information and developed the periodic table of chemical elements. In the following centuries, the knowledge about them was expanded. The essence and importance of chemical elements was already puzzled over by the Greek philosopher Aristotle more than 2,000 years ago! Ancient man knew different elements, such as carbon or sulphur. The structure of the periodic table is the result of multi-century experiments and observations from around the world. 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 periodic table of elements (Mendeleev’s table) 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 ![]()
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