What does group mean in a periodic table?

Answer 1

A group is a vertical column in the Periodic Table; there are 8 groups, numbered, always in Roman numerals, I to VII from left to right, with group O (the noble gases) on the far right-hand side. The atoms of elements within any given group have similar outer electron configurations

Answer 2

The group number is the number of electrons in the outer shell of the element.

They are columns that move along from left to right, 1 to 18, increasing.

So elements in group one will have one electron in its outer shell, and so on.

Note: electrons in the outer shell of an element are called valence electrons.

Answer 3

In the periodic table, a group refers to the columns of elements that share similar chemical properties due to having the same number of electrons in their outermost shell. There are 18 groups in the modern periodic table.