Question

The atomic radii of three elements A, B and C of the periodic table are 186pm, 192pm and 143pm respectively. Arrange these elements in the increasing order of atomic numbers in the period by giving reasons

Answer 1

192<186<143 we know that the atomic radius decreases from moving left to right in a period and the atomic number increases from left to right hence we can devise that the element with the smallest radii will be of the highest atomic number

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