The modern periodic table is the arrangement of all the known elements such that elements with similar characteristics are grouped. We know that the modern periodic table is made up of horizontal periods and vertical groups. In this article, we are going to study the similarities and periodicity of elements across the periodic table. We will study the different blocks: s-block, p-block, d-block, f-block and their characteristic properties, metals, metalloids, nonmetals, halogens, and noble gases.
Question 88.(a) (i) How is the variability in oxidationstates of transition metals different from that of the p-block elements?(ii) Out of Cu+ and Cu2+, which ion is unstable in aqueous solution and why?(iii) Orange colour of Cr2O72- ion changes to yellow when treated with an alkali. Why?(b) Chemistry of actinoids is complicated as compared to lanthanoids. Give two reasons. (Delhi 2017)Answer:(a) (i) In transition elements, the oxidationstates can vary from +1 to highest oxidation state by removing all its valence electrons and the oxidation states differ by 1, e.g., Fe2+ and Fe3+ while in p-block elements, the oxidation states differ by 2, e.g., +2 and +4 or +3 and +5, etc.
reasoning questions on d and f block elements pdf 38
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