In what way are elements in the same column of the periodic table

You can see wich group by the last out shell. Group 1 has 1 electron in the outershell

The periodic table also has a special name for its vertical columns. Each column is called a group. The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons.

Hope this helps. :)

Answermilliliters and cubic centimeters;