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| 1. |
State the characteristics of S-block elements of modern periodic table. |
| Answer» \ts block elements have spherical s orbital as their outermost orbital.\tSince s orbital can accommodate a maximum of 2 electrons, each one of these elements have 1 or two electrons.\tThese s electrons are lost very easily to form monopositive ions by lsoing one electron in the outermost orbital or dipositive ions by losing 2 electrons.\tThey have low ionisation potentials and low electronegativities.\tThey are good conductors of heat and electricity, excepting H2 and He.\tThey are silvery, shiny metallic substances, (with the exception of hydrogen and helium which gaseous nonmetals).\tThey are malleable and ductile, i.e., we can make sheets and wires from them, (exception: H2, He)\tThey readily form ionic salts with most nonmetals.\tAqueous solutions of their oxides are alkaline. | |