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Q.

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

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a

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

b

it helps to predict the stable valency states of the elements

c

it reflects trends in physical and chemical properties of elements

d

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

answer is A, B, C.

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Detailed Solution

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

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