Question

For each of the following species, give the total number of electrons, the number of electrons in the valence shell, and the number of core electrons.

Species	Number of electrons	Number of electrons in valence shell	Number of core electrons
Po
Pb2+
Cl-

Answer 1

Species Number of electrons Number of core cbetont. Number of electrons invalence shell 78 Po 78 Pb2+ Por electronic configuration regary sa to pot Ele) 6524614 5ddiº 6p4 Here valence Shele is 656 6p So, which contain total of 6 electron so, it has 6 ralence electron olet of total 84 electron so, # remaing 78 electrons are care electron. Pb2+ : Electronie. Configuration : [Xe] 652484450106p6 . Here Pb have electronic configuration [Xe] 659 4 14 500 6p2 which has total of 82 electron but after removal of ze - it becomes Pb2+ which has a electronic Configuration [Xe] 65² 46 14 5610 60°. Here P6 27 have 2 valence electron in 65 Orbital and 78 Core eletron. a: Electronic configuration of a :[1322s²2pG35² 386] Here ci atom have electronie configuration 7s 2252 2pfi352 3p5. Now, ci atom grein another electron in valmee Shell and it chave then total of 18 electron art Valence shell of a contain: 8 euctron (35&3p) So, No. of eure electron = 10