which+elements+belong+to+period+3+why
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sodium, magnesium, aluminium, silicon, phosphorus, sulfur, chlorine, and argon.
These belong so period 3 beacuse they(elements) have 3 shells in their atom
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From atomic number 21 to 30.the elements are scandium,titanium,vanadium,chromium,manganese,Iron,cobalt,nickel,copper and zinc.the elements belongs to 3rd period because to manage the atomic number and radius by increasing through the period and also for understand easily.
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