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प्रश्न
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 a reason, arrange these elements in the increasing order of atomic numbers in the period.
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उत्तर
The elements in the increasing order of atomic numbers in the period is X<Z<Y. On moving from left to right in a period, the atomic number increases. Hence, the size of the atomic radius decreases.
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