Question

structures of an atom for first twenty element.

Answer 1

Number of electrons in each shellElementSymbolElectrons in shell 1Electrons in shell 2Electrons in shell 3Electrons in shell 4HydrogenH1---HeliumHe2---LithiumLi21--BerylliumBe22--BoronB23--CarbonC24--NitrogenN25--OxygenO26--FluorineF27--NeonNe28--SodiumNa281-MagnesiumMg282-AluminiumAl283-SiliconSi284-PhosphorusP285-SulfurS286-ChlorineCl287-ArgonAr288-PotassiumK2881CalciumCa2882