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An atom is half full when one electron is in each orbital. An atom is completely full when there are two electrons in each orbital. Remember that electrons fill all the empty orbitals first before pairing with electrons in them.
Amanda, half-filled orbitals or full orbitals are more stable than a subshell with only a few electrons because the atom is trying to gain or lose electrons to meet either of those stages. For example a 2p orbital can contain up to 6 electrons. It's happier state is either 3 or 6, and if it is at 4 it is unhappy and will try to lose an electron to go back to 3.
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