My son taught me this on a video call, scribbling on paper. For sulphur, atomic number 16, just fill the shells: 2, 8, 6 — so valency is 2. But I remember it wrong first, calling it 6, because my shift ends at 6 AM. It’s that final hour, counting down electrons instead of minutes until the sky turns sngewbha, that helps the lesson stick.
#exams#study
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