Question
Using the Aufbau principle, write the electronic configuration for the ground state of the following atoms:
(i) Boron (Z = 5)
(ii) Neon (Z = 10)
(iii) Al (Z = 13)
(iv) Chlorine (Z = 17)
(v) Calcium (Z = 20).
Solution
(i) Boron (Z = 5),
Electronic configuration = 
(ii) Neon (Z = 10),
Electronic configuration = 
(iii) Al(Z =13)
Electronic configuration
(iv) Chlorine (Z = 17),
Electronic configuration 
(v) Calcium (Z = 20),
Electronic configuration
