Final answer:
The incorrect statement regarding the periodic table is that the atomic radius decreases from left to right.
Step-by-step explanation:
The incorrect statement regarding the periodic table is: The atomic radius decreases from left to right.
The atomic radius is defined as the size of an atom. In general, the atomic radius tends to increase from right to left and from top to bottom in the periodic table. This is because as you move from left to right across a period, the number of protons and electrons increases, resulting in a stronger attraction between the electrons and the nucleus, causing the atomic radius to decrease. However, as you move down a group, the number of energy levels or shells increases, which results in an increase in atomic radius.
Therefore, the correct statement is that elements are arranged in the increasing number of atomic number, and the atomic radius tends to increase from top to bottom and decrease from left to right in the periodic table.