what is hunds rule plz explain clearly
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Hunds rule
Hunds rule of multiple multiplicity States the order of filling the electrons one by one in each energy state. Hund rule state that in any orbital electrons are first Field one by one and then they orders are made again from the beginning. For example if you are filling the electron in p subshell then ,as we all know that there are three orbitals in the P subshell so electrons are first filled one by one from -1 0 and +1 and then if we have to fill the fourth electron then we have to start from the beginning that is -1 for IV electron 0 for V electron and +1For 6 electron.
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Hund's rule: every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied, and all electrons in singly occupied orbitals have the same spin.