Susumu Tonegawa

photo:www.tonegawalab.org

Susumu Tonegawa was born on September 6, 1939, a Japanese scientist who won the Nobel Prize for Physiology or Medicine in 1987 for his discovery of the genetic mechanism that produces antibody diversity. 

Defence Day (Pakistan )

Defence Day is celebrated in Pakistan as a national day on 6 September in memory of those who martyred in the Indo-Pakistani war of 1965 and successful defence of Lahore, Sialkot and other important areas of the country.

photo:www.behance.net

In an atom, the order of filling up of the orbital is governed by

photo:chemistry.tutorvista.com

Ans: Aufbau's principles