Question

Describe the main features of Mendeleev's periodic table?

Answer 1

Periodic table:

• All the known elements are arranged in a tabular form called a periodic table.
• Dmitri Mendeleev is often referred to as the Father of the Periodic Table.
• According to Mendeleev's periodic table, all the known elements are arranged according to their increasing atomic masses.

The main features of Mendeleev’s periodic table are:

• In Mendeleev's periodic table, vertical columns are named as groups, and horizontal rows are named as periods.
• There are seven horizontal rows called periods and eight vertical columns called groups.
• All the groups are divided into subgroups.
• Along with that he left some vacant spaces in the periodic table as he predicted that another element is going to be placed there which will be discovered later.
• In this manner, he left a vacant space below aluminium and germanium. As he did not know the elements, he named them Eka- aluminium and Eka- silicon.
• Later when other elements were discovered, eka- aluminium was the element gallium which is placed below aluminium in the modern periodic table. Similarly, germanium took the place of eka-silicon which is below silicon in the modern periodic table.