Atomic Weights
they have same number of valence electrons and hence similar chemical properties.
The columns show same behaviour. They have same properties.
periodic table
Columns in the periodic table are called "groups" and there are 18 groups in the periodic table.
groups are the vertical columns on the periodic table
groups
The vertical columns of the periodic table are called groups or families.
The columns on the periodic table are called Groups.
The vertical columns in a periodic table are called Groups.
The word for columns in the periodic table is groups. They are also referred as families.
The number of electrons in the outter shell
There are 18 columns.
there are 18 columns
There are 18 A columns on the periodic table, also known as the groups. These columns represent elements with similar chemical properties and are numbered from 1 to 18.