(c) a total of three shells, with four electrons in its valence shell? In the case of non-metal reactivity, decreases down the group because of the tendency to gain electrons decreases. For example. It helps us to understand how different compounds make up different elements. The elements belonging to a particular group is known as a family and is usually named after the first element. Q5. (incomplete) 89Ac and elements 104 through 112. Fr –) is, however, incomplete and contains at present only 26 elements.          (b) more reactive than A The IE of alkali metals is the lowest, therefore, their oxides and hydroxides are the strongest bases. He grouped the elements on the basis of atomic mass. (iii) Metallic and Non-Metallic properties: In the modern periodic table metals are on the left side and non-metals on the right side of the table. (i) Mendeleev left a number of gaps in his table to accommodate the new elements which would be discovered later on. Limitations of Mendeleev’s Periodic Table He placed them in a new group. The classification of similar elements into groups makes the study of elements easier. However there are some exceptions to the general trend -. Increase in the discovery of different elements made it difficult to organise all that was known about the elements. Many attempts have been made by different scientists in order to classify elements. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. 3 to 12gp – transition elements. The electron affinities are indirectly measured with the help of Born-Haber Cycle,  i.e.. Where, S, D, IE, EA and U are the heat of sublimation, bond dissociation energy, ionization energy, electron affinity and lattice energy respectively. Use the following table, Example : Name the IUPAC name of the element of atomic  number 108 : Name will be Unniloctium and symbol - UnO. Elements of a triad show similar chemical properties. On moving down the group the valence shells become far away from the nucleus and thus the atomic radius increases. Live your dream of studying at AIIMS with comprehensive coaching and guidance from seasoned mentors. k.setAttribute("data-push", "1"); Name the scientist who performed x-ray studies and confirmed atomic no. 1. 2. Hence these elements are called d-block elements. Here we have given NCERT Class 10 Science Notes Chapter 5 Periodic Classification of Elements. Johann Wolfgang Dobereiner, a German chemist, classified the known elements in groups of three elements on the basis of similarities in their properties. Required fields are marked *, Classification of Elements based on s,p,d and f Orbitals. He could predict proportions of several elements on basis of their position in periodic table like Ga, Sc, etc. CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES THE PERIODIC TABLE OF THE ELEMENTS PERIODIC TABLE It is a table of ele... 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