the element from the elements be and mg having a lower nuclear charge
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the answer of this question is rubidium
Swapnel1:
The element must be between Beryllium and Magnesium
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They have equal nuclear charge but they atomic sizes are different. Be has a smaller atomic size and thus it is less reactive than mg
the elements between beryllium and magnesium have same nuclear charge???
no elements in the same group does have the same nuclear charge
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