Question

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

Answer 1

B, A, C

Size of atoms decreases as we go left to right in periodic table because the nuclear charge increases

Answer 2

b, a, c

size of atom decrease when move along the group