What are the first 20 elements ?
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HydrogenH1---HeliumHe2---LithiumLi21--BerylliumBe22--BoronB23--CarbonC24--NitrogenN25--OxygenO26--FluorineF27--NeonNe28--SodiumNa281-MagnesiumMg282-AluminiumAl283-SiliconSi284-PhosphorusP285-SulfurS286-ChlorineCl287-ArgonAr288-PotassiumK2881CalciumCa2882
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