To find valency, I learned you must see the outermost shell electrons—sulphur’s is six, so valency two, calcium’s is two, so valency two. But I had to sit with my granddaughter’s old textbook for hours to grasp this, bhaiji. The obvious answer says it’s simple, yet for me, it was like recalling a lost Pahari folk song—the tune is there, but you must hum it slowly, piece by piece.
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