We are talking about the periodic table in which elements where put under different rows and columns according to their atomic number (number of protons) in ascendant order.
In rows or periods we can findtrends in some properties like atomic radius, electronegativity, etc...). So they are not similar in size. Option A is a false statement.
Also, they were organized in groups or columns according to their similar electronic configuration and chemical properties (like noble gases, halogens, etc...) This means option B is the correct statement.
(B) Elements in the same column have similar electronic and chemical properties
Explanation:
The periodic table sorts the elements by their organization, it lists the elements in rows called periods and columns called groups or families, and in ascending order of their atomic numbers.
The horizontal lines in the periodic table are called periods and the vertical columns are called groups, and the electron and chemical properties of the elements in the same group are similar.
