Acknowledgement

I would like to thank Dr.Hema Peese Mam for helping me to establish this website.

References:

• Chemistry Textbook for Class XI (NCERT) - Prof.J.V.Narlikar Chairperson, Advisory group in Science and Mathematics
• Chemistry Textbook for Class XI (SSC) - Maharashtra state board of secondary and higher secondary education, Publisher:Maharashtra state bureau of text book production and curriculum research,Pune-411004
• https://commons.wikimedia.org/wiki/File:Johann_Wolfgang_D%C3%B6bereiner.jpg
• https://www.google.co.in/search?q=unitary+theory+of+chemistry&rlz=1C1SQJL_enIN776IN776&oq=unitary+theory+of+chemistry&aqs=chrome..69i57.19059j0j7&sourceid=chrome&ie=UTF-8
• https://www.google.co.in/search?q=The+s-Block+elements&rlz=1C1SQJL_enIN776IN776&oq=The+s-Block+elements&aqs=chrome..69i57j0l5.3158j0j7&sourceid=chrome&ie=UTF-8
• https://www.google.com/url?q=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FBlock_%28periodic_table%29%23cite_note-1&sa=D
• https://chem.libretexts.org/Core/Inorganic_Chemistry/Descriptive_Chemistry/Periodic_Trends_of_Elemental_Properties/Periodic_Properties_of_the_Elements
• https://www.google.com/url?q=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FInner_transition_metal&sa=D