sodium magnesium aluminium have following things i n common : All of them are metal ,All of them from positive ions,All of them are placed in the same period If the elements are arranged on the basis of the similarity in their chemical properties, why are the above mentioned elements placed in different groups in the modern periodic table
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Elements that are in the same period have the same energy (or close to the same energy) levels of their outermost valance electrons. ... Both Sodium and Magnesium have their outermost valance electrons in the same third period. Sodium has the electron configuration of. 1s22s22p63s1 for a total of 11 electrons.
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sodium + megnesium + aluminium
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