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 Holocaust, as presented in this resource center, is defined as the sum total of all anti-Jewish actions carried out by the Nazi regime between 1933 and 1945: from stripping the German Jews of their legal and economic status in the 1930s`; segregating and starvation in the various occupied countries; the murder of close to six million Jews in Europe.