Question

the atomic radii of three elements A B and C of a Periodic Table are 186 CM 104 cm and 143 CM respectively giving arrays and arrange these elements in the increasing order of atomic number in the period

Answer 1

Atomic radius of C is smallest

Atomic radius of A is largest

B<C<A

Answer 2

atomic radius decreases as we move left to right in a period
atomic number increases as we move left to right in a period.
Hence as the atomic number increases,the atomic radius decreases.
186--143---104.