Question

how can you tell that two elements have many properties in common? they have the same atomic weight. they are listed in the same vertical column or group. they have the same atomic mass. they are listed in the same row or period.

Explanation:

Elements in the same group (vertical column) of the periodic table have the same number of valence electrons, which leads to similar chemical properties. Atomic weight and mass don't determine similarity in properties as much as valence - electron configuration. Elements in the same period have different numbers of valence electrons and different properties.

Answer:

B. They are listed in the same vertical column or group.