FAST AND CORRECT PLSSS
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i valence electron of Rb is 7
ii the no of shells in the Sr will be 5 because ethe elcyron configuration is 2,8,18,8,2
iii k will be metal because eit will have 1 in the outer most shell so it will donate one electron
IV Sr will have the larger atomic size
v Rb,ca,mg,be
Hope that this will help you
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