Isobars are atoms that have same atomic mass but different atomic number. They have different atomic numbers because they have different numbers of protons. They have the same atomic mass because they have just enough neutrons to make the same total of nucleons. Isobars occur at different places in the Periodic Table.
The Holocaust (also called Ha-Shoah in Hebrew) refers to the period from January 30, 1933 - when Adolf Hitler became chancellor of Germany - to May 8, 1945, when the war in Europe officially ended.
The beginning of the WW2 end came with the capitulation of the German army on May 5th. The end of hostilities in Japan is known as VJ Day (Victory in Japan Day). The entire war began in 1939 and ended in 1945, lasting more than 5  years, or 68 months (World War II Casualties).