Question

Answer the following question regarding the modern version of Mendeleev's periodic table.

How are the groups numbered?

Answer 1

In the modern version of Mendeleev's periodic table, groups are numbered in Roman numerals from I to VIII.

• In the modern version, another group called group-0 was also added so as not to disturb the entire periodic table.
• So the groups are numbered from 0 to VIII.

Groups: The vertical columns in Mendeleev's periodic table are known as groups.

• The number of groups present in the original Mendeleev's periodic table was 8 and later, in the modified form, another group called group-0 was added to the extreme left side of the periodic table.
• In Mendeleev's periodic table, elements were arranged in the order of the increasing atomic weights.
• The elements were arranged in the form of vertical columns called groups and horizontal rows called periods.