Raman and Sonu were friends. They both are student's of class XI. Many times Raman helped Sonu in his studies. One day, when they were discussing about electronic configuration, Raman told Sonu that writing electronic configuration is very important as this helps in knowing why the substances present around us differ from each other like water flows but salt or ice does not? How can we improve their properties and make them more useful? He also told Sonu that while writing electronic configuration, always follow, Pauli's principle, Hund's rule and Aufbau principle. After that the discussion, Sonu found this topic very easy.
(a) Write the electronic configuration of Na and Ar.
(b) What is the valency of Na and Ar elements?
(c) How can one predict the nature of compound with help of electronic configuration?
(d) What values are shown by Raman?