What is the term of Group in the periodic table?

Answer 1

A group is a vertical column on the Periodic Table. In the past, they were labeled 1A, 2A all the way up to 8A for the noble gases with the transition elements being labeled using 1B, 2B, etc. in the United States. Recently, the IUPAC has numbered the groups as 1-18. For the representative elements, the ones column of the group number delineates the number of valence electrons in the atoms of each element.