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.
In the modern periodic table as we move in a periof left to right the atomic number of the element increases and the size of the atom is decreased.
X<Z<Y
These elements are arrange in this manner, X comes first because its atomic radii is greatest among these three and then Z and lastly Y is placed because it has least atomic radii among all.