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12,19,21
Element with atomic number 38 i.e Sr will show the same physical and chemical properties as that of calcium whose atomic number is 20
This is because , they belong to the same group of the periodic table (group II) , All the elements of a group have similar properties .
in group 2 only Be doesnot show similar properties to other elements because of its diagonal relationship with Al .
the rest of them show the same physical and chemical properties.
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PLEASE APPROVE
it should be 12 and 38 since they belong to the same group of alkaline earth metals
12 & 38
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