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Hydrogen, helium ,
Xe, He, many more
Al
Mg and Cu
He leave a gap bacuause
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G and H have the same number of electronic shells but different number of electrons in their outermost shell. It was found that elements A and G combine to form an ionic compound. ... Oxides of elements A and B are basic in nature while those of E and F are acidic. The oxide of D is almost neural.
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