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.
Adolf Hitler was the leader of Nazi Germany from 1933 until his suicide in 1945. Hitler was responsible for starting World War II and for killing more than 11 million people during the Holocaust. Dates: April 20, 1889 -- April 30, 1945.