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Chemistry, 22.11.2020 14:00 destanie1030

For the element Selenium (Se), state: How many principal energy levels (PEL's) it has? How many (PEL's) and which ones are occupied? How many (PEL's) and which ones are full?
How many Sub-Levels it has? How many (sub levels) and which ones are occupied? How many (sub levels) and which ones are full?
How many Orbitals it has? How many (orbitals) and which ones are occupied? How many (orbitals) and which ones are full?

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