Modelová Otázka ID 2795 - 
Kolik valenčních elektronů má atom prvku s protonovým číslem 14?
Správná odpověď je: C
V první a druhé periodě je dohromady 10 elektronů (2 + 8), prvek s protonovým číslem 14 musí tedy být čtvrtý prvek třetí periody – má 4 valenční elektrony.
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