 Hello everyone, I am Maravanji Sivaramanya Balakrishna, professor of chemistry at IIT Bombay. My research interests include main group and organophosphorous chemistry, transfer metal organometallic chemistry, homogeneous catalysis and biological applications of copper and gold complexes containing less toxic phosphorus-based ligands. So sometime back I had offered a course on the chemistry of main group elements. It is a pleasure to tell you that I am offering another course on chemistry titled advanced transfer metal chemistry in a series of 60 lectures of 30 minutes each under NPTEL that is National Program on Technology Enhanced Learning. To begin I shall talk about the historic background to the modern periodic table. It is very interesting and important to know how this concept of bringing all known elements in the form of a table in some order to understand their physical and chemical properties and trends if there are any. Lecture includes general introduction to transfer elements and bonding concepts such as valence bond theory, crystal field theory and ligand field theory are discussed in detail with several examples especially. Crystal field theory is discussed in depth to make you familiar in writing crystal field diagrams for most of the ligand fields that you rarely see in textbooks. For example complexes having geometry such as linear hexagonal planar or square antiprismatic and many more related geometries. Another important topic in coordination chemistry and organometallic chemistry is 18 electron rule and I shall discuss this concept in detail with numerous very interesting and very puzzle type examples metal-metal multiple bonding including quadruple bonding and quintuple bonding are also discussed in detail using molecular orbit theory concept. Organization of ligands by donor atoms is elaborated to understand the importance of ligands in controlling the reactivity at the metal center and their possible utility in various applications. Two important reactions in coordination chemistry and organometallic chemistry are oxidative addition and reductive elimination when it comes to their application in homogeneous catalysis for a variety of organic transformations. So these reactions are discussed by considering suitable examples even in bringing thermodynamic and bonding concepts. For characterization of metal complexes multi-nuclear NMR and UV visible spectroscopy are very important and these two topics are discussed in brief to make you familiar with the interpretation of data and especially to assess the purity of compounds in case if you make them in the laboratory. Second application of trans elements and their compounds in various applications are also discussed in brief. Another important objective of this course is to convince young minds that the inorganic chemistry is not at all difficult or memory based despite inorganic chemistry revolves around the entire period table containing as many as 118 elements. Studying basics and reading textbooks is very essential while studying chemistry or any other subject for that matter. To prepare your mind to understand and learn chemistry it is very simple. I am sure you are familiar with the term octahedral geometry. Assume yourself as a metal placed at the center of an octahedral. The four vertices in the plane should be your sincerity, your honesty, your discipline and your dedication. The fifth vertex should be occupied by your determination. If that happens at the top axial position your attitude stays very firmly to prepare you to achieve whatever you want whether it is in studies or in your profession. I wish you all the very best. I am sure you will enjoy this course. In order to make this course very live I shall try to add some cartoons in between. If you come across any doubts you can always contact me through my email. My doctoral students Mr. Ankit and Ms. Ghazal are assisting in this course. Once again I welcome you to my new course and thank you and God bless you.