Electronic configuration of first 20 elements


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Write electronic configuration of first 20 elements

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Hydrogen ,
helium (He),
lithium (Li) ,
beryllium (Be),
boron (B),
carbon(C)
nitrogen (N)
oxygen ( O)
fluorine (F)
neon (Ne)=2,8 (stable)(noble gas),
sodium(Na),
magnesium(Mg),
aluminium (Al),
silicon (Si) ,
phosphorous(P),
sulphur (S) ,
chlorine (Cl),
argon (Ar) ,
potassium (K),
calcium (Ca),

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