Question

what is the signifcance of the vertical columns on the periodic table? they have similar masses. they have the same number of neutrons in their nuclues. they have similar properties. they have their valence electrons in the same energy level.

Explanation:

Elements in the same vertical column (group) of the periodic table have the same number of valence electrons, which leads to similar chemical properties. Masses, neutron - numbers, and energy - levels of valence electrons are not the defining similarities for group elements.

Answer:

They have similar properties.