Describe the main features of Mendeleev’s periodic table

The main features of Mendeleev’s periodic table are arrangement of elements by atomic mass, grouping based on properties, spaces for undiscovered elements, and correction of atomic masses. Dmitri Mendeleev, a Russian scientist, created the first widely accepted periodic table in 1869. His table organized elements based on their atomic masses and chemical properties.

Main Features

• Arrangement by Atomic Mass: Elements were placed in order of increasing atomic mass.
• Rows and Columns: Horizontal rows were called periods, and vertical columns were called groups.
• Similar Properties: Elements with similar properties were placed in the same group.
• Prediction of New Elements: Mendeleev left gaps for undiscovered elements and predicted their properties accurately.
• Correction of Atomic Masses: He corrected atomic masses of some elements to fit the pattern.