AP EAMCET202021 Sep 2020Evening ShiftChemistryStructure of AtomActual
The electronic configuration of ( Cs ) is
Options
- A([ Kr ] 5 ~s ^1 )
- B([ Xe ] 6 ~s ^1 )
- C([ Rn ] 7 ~s ^1 )
- D([ Ar ] 4 ~s ^1 )
Correct answer
B. ([ Xe ] 6 ~s ^1 )
Step-by-step solution
Caesium atomic number is 55. Thus, electron configuration of caesium is (1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 4 s^2 3 d¹⁰ 4 p^6 5 s^2 4 d¹⁰ 5 p^6 6 s^1 ) or [Xe] (6 s^1 ). Hence, correct option is (b).