Explain, in terms of electrons, why the bonding in strontium sulfide, Srs, is similar to the bonding in magnesium bromide, MgBrz.
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What happens when light is scattered?

How many liters of oxygen gas, at standard temperature and pressure, will react with 35.8 grams of iron metal? 4 fe (s) + 3 o₂ (g) → 2 fe₂o₃ (s)

Light waves can move through , but they travel fastest when they move through a(n) .