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Which two elements of the following belong to the same period? Al, Si, Ba and O

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Al and Si as they both belong to period 3 rd . Moreover on the basis of electronic cinfiguration their period can be found For example Al has 2,8,3 while Si has 2,8,4 thus there are three shell ie K,Land M in each of the atom
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Al,Si belongs same.3rd period.
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