Isomerism is the phenomenon whereby certain compounds, with the same molecular formula, exist in different forms owing to their different organisations of atoms. The concept of isomerism illustrates the fundamental importance of molecular structure and shape in organic chemistry.
By signing the nuclear deal, Iran has given up that nuclear umbrella for as long as two decades and made the case for the United States to further strengthen the conventional military capacities of Israel and the GCC.
During a summit meeting in Vienna, President Jimmy Carter and Soviet leader Leonid Brezhnev sign the SALT-II agreement dealing with limitations and guidelines for nuclear weapons. The treaty, which never formally went into effect, proved to be one of the most controversial U.S.-Soviet agreements of the Cold War.or the United States, fear that the Soviets were leaping ahead in the arms race was the primary motivator. For the Soviet Union, the increasingly close relationship between America and communist China was a cause for growing concern. In June 1979, Carter and Brezhnev met in Vienna and signed the SALT-II agreement.