Question
Why is the formula for calcium sulfide CaS and not $\mathrm{Ca}_{2} \mathrm{~S} ?$
Step 1
The electron configuration for calcium is $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2$, which totals 20 electrons with 2 valence electrons. The electron configuration for sulfur is $1s^2 2s^2 2p^6 3s^2 3p^4$, which totals 16 electrons. Show more…
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