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(a) Writethe electronicconfigurations of theelementsgiven below: A (At. No=0), B(At. N=12) , C (At. No=29), D(At.No=54) , and E(At. No=58). (b) Also predict the period group numberand block to which they belong. ( C) Classify them as representativeelements , noble gases, transition and inner transitionelements.

Answer» <html><body><p></p>Solution :(a) Electronicconfiguration of the elements A,B ,<a href="https://interviewquestions.tuteehub.com/tag/c-7168" style="font-weight:bold;" target="_blank" title="Click to know more about C">C</a>,D and Eare asfollows : <br/> `{:("Element ",,"At.No .",," Electronic configuration "),(A,,9,,1 s^(2) 2s^(2) 2p^(2)),(B,,12,,1 s^(2) 2s^(2) 2p^(6) 3s^(2)),(C,,29,,1s^(2) 2s^(2) 2p^(6) 3s^(2) <a href="https://interviewquestions.tuteehub.com/tag/3p-311052" style="font-weight:bold;" target="_blank" title="Click to know more about 3P">3P</a>^(6) 3d^(10) 4s^(1)),(D,,54,,1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(10) 4s^(2) 4p^(6) 4d^(10) 5s^(2) 5p^(6)),(E,,58,,1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(10) 4s^(2) 4p^(6) 4d^(10) 5s^(2) 5p^(6) 6s^(2) 5d^(1) 4f^(1)):}` <br/>(b) Element Areceives the last electron in 2p-orbital it belong to p-blockelements and its group number = 10+ No.of electrons in thevalence shell =10+ 7=17. Further the period of theelement = No. of thenumberquantum numberof the valenceshell= 2nd. <br/> Element B receives the lastelectron in 3s-orbitalthereforeit belongto s-block elements and itsgroupnumber= No ofelectrons in the valenceshell=2 .Further the periodof theelement= No of theprincipal quantum number of the valenceshell=3rd <br/> Element C receives the lastelectron in the3d-orbital therforeit belong to d-block elements and its group number= No ofelectrons in the penultimate shelland valenceshell= 10+ 1= 11. Further the period <a href="https://interviewquestions.tuteehub.com/tag/ofthe-1129561" style="font-weight:bold;" target="_blank" title="Click to know more about OFTHE">OFTHE</a> element= No of principal quantum number ofthe valence shell=4th. <br/> Element D receives its lastelectron in the4f-orbitaltherefore it belongto f-block elements and itsgroup number = 10+ No. Of electrons in teh valenceshell= 10+8=18. Furtherthe periodof theelement = No of theprincipal quantum numberof thevalenceshell= 5th. <br/> ElementE receives itslastelectron in 4f-orbital therforeit belong to f-blockelementsand itsgroup numberthat the fillingof 4f- orbitaloccursonly whenone electron has already entered 5d-orbital .Therefore element E belongto f-block elements and not to d-block elements .Sinceit belongto lanthanideseries thereforeas suchis does not haveany group number of its own but is usually considered to liein group <a href="https://interviewquestions.tuteehub.com/tag/3-301577" style="font-weight:bold;" target="_blank" title="Click to know more about 3">3</a> . However, its period= Noof theprincipalquantum numberof the valence shell=6th <br/> ( c) Elements A and Bare representative elements sincetheirlastelectron enters p- and s- orbitalrespectively. <br/> Elements C isa transitionelement sinceit receivesits lastelectronin thed- orbital <br/> Element D is a p- blockelementwithcompletely <a href="https://interviewquestions.tuteehub.com/tag/filled-2641169" style="font-weight:bold;" target="_blank" title="Click to know more about FILLED">FILLED</a> s- and p- orbitalof the valenceshell sucha typeofp- blockelementis calleda noblegas. <br/> Element E isan inner transitionelementsinceit receive its lastelectron in the f-orbital</body></html>


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