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(a) Explain why: (i) All the elements ...

(a) Explain why:
(i) All the elements of a group have similar chemical properties.
(ii) All the elements of a period have different chemical properties.
(b) The atomic radii of three elements `X,Y` and `Z` of a period of the periodic table are 186 pm, 104 pm and 143 pm respectively. Giving reason arrange these elements in the increasing order of atomic numbers in the period.

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