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The statements that are true for the long form of the periodic table are :

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it reflects the sequence of filling the electrons in the order of sub energy levels s, p, d and f

it helps to predict the stable valency states of the elements

it reflects trends in physical and chemical properties of elements

it helps to predict the relative ionicity of the bond between any two elements

answer is A, B, C.

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periodicity will be justified by arrangement of elements,filling in energy order of subshells,where similar elements will occur

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