When filling degenerate orbitals, electrons fill them singly first, with parallel spins refers to as <u>Hund's rule</u>.
Hund's rule describes that the electrons are filled single first in each orbital with the same spin; and only after that, the electrons are paired with another electron within the same orbital. It means that before the double occupation of any orbital, the single occupation of every orbit in the sublevel happens.
The given statement defines Hund's rule as the lowest energy configuration for a particular atom that has the maximum number of parallel spins in the degenerate orbitals. In a subshell, all the degenerate orbitals are singly occupied with one electron before they are doubly occupied.
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The Great Depression of America!
It all began with the economic recession in August 1929, but everything got worst on October 24th, 1929: The Black Thursday, or the Crash of Wall Street, Which affected all the world. Then a year later, Banks began to fail. The economy was dead, not only for the united states, but for the whole world. It stayed like that till World war 2 in 1939.
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