Question

the atomic radii of three element A, B and C are the periodic table are 186 pm, 192 pm and 143 pm respectively. arrange these element in the increasing order of atomic number in the period by giving reasons .

Answer 1

Increasing order of atomic number results in more electrons which furtherly causes addition of shells in the atom resulting in greater atomic radii. Hence increasing order of atomic number shall be C <A<B.

Hope I made it clear.

Answer 2

1. 192 pm, 2. 186 pm and 3. 143 is the correct arrangement of the elements