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misseylaLv10
26 Jun 2022
What are the main energy levels where the valence electrons belong called?
What are the main energy levels where the valence electrons belong called?
papayaprofessorLv10
5 Sep 2022
evangelistaLv10
26 Jun 2022
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kiennguyenLv2
26 Jun 2022
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26 Jun 2022
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