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Explain physical properties of group 14 elements. |
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Answer» Solution :Electronic Configuration The valence shell electronic configuration of these elements is `ns^2 np^2`. COVALENT Radius: There is a considerable increase in covalent radius from C to Si, there after from Si to Pb a SMALL increase in radius is observed. This is due to the presence of completely filled d and f orbitals in heavier members. Ionization Enthalpy : The first ionization enthalpy of GROUP 14 members is higher than the corresponding members of group 13. The influence of inner core electrons is visible here also. In general the ionisation enthalpy decreases down the group. Small decrease in `Delta_iH` from Si to Ge to Sn and slight increase in `Delta_iH` from Sn to Pb is the CONSEQUENCE of poor SHIELDING effect of intervening d and forbitals and increase in size of the atom. Electronegativity Due to small size, the elements of this group are slightly more electronegative than group 13 elements. The electronegativity values for elements from Si to Pb are almost the same. |
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