Question

Write first 20 elements of periodic table with their symbols

Answer 1

ElementSymbolElectrons 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-PotassiumK2881CalciumCa2882l
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Answer 2

Hydrogen--H
Helium--He
Lithium--Li
Beryllium--Be
Boron--B
Carbon--C
Nitrogen--N
Oxygen--O
Fluorine--F
Neon--Ne
Sodium--Na
Magnesium--Mg
Aluminium--Al
Silicon--Si
Phosphorus--P
Sulphur--S
Chlorine--Cl
Argon--Ar
Potassium--K
Calcium--Ca