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 final date that might be considered as the start of the Holocaust is 1941. This is when the Nazis implemented the Final Solution.. This was a plan to exterminate all Jews in Europe. As part of the final solution, Jews were deported to concentration camps in great numbers.