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.
By a well established convention the dates are generally given as 1 September 1939 to 2 September 1945. <br /> <br /> The Second World War has start and end points that differ slightly, depending on national perspectives and on what part of the world is being described. In Europe, the war began with Hitler's attack on Poland, September 1st, 1939.