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Biology, 05.11.2020 22:00 ahmetagayew2004

Which element has four (4) valence electrons and five (5) energy levels? Tin (Sn)
Ob
ос
Arsenic (As)
Beryllium (Be)

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Which element has four (4) valence electrons and five (5) energy levels? Tin (Sn)
Ob
ос...
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