Question

why are there empty spaces in the rows on the periodic table? (1 point)
so that elements with similar masses are right next to each other.
so that elements with similar properties are aligned in the same column.
because the elements on the periodic table are arranged by order of discovery.
because elements of the same size are found in the same rows.

Explanation:

The periodic table arranges elements by atomic number and groups elements with similar chemical properties in the same columns (groups). Empty spaces are left to maintain this alignment of elements with similar properties.

Answer:

So that elements with similar properties are aligned in the same column.