Question

State description of Mendeleev's periodic table of elements.

Answer 1

Mendeleev's periodic table:

• Dimitri Ivanovich Mendeleev arranged all the 63 elements known at that time in increasing order of their atomic mass.
• Mendeleev's periodic law states that physical and chemical properties are the periodic function of their atomic masses.

Characteristics of Mendeleev's periodic table:

• Mendeleev's periodic table consists of the vertical columns called groups and horizontal rows called periods.
• There are eight groups from I to VIII, each group is divided into two subgroups. Group VIII has no sub-group.
• All elements of a sub-group have similar properties and the same valency, which is equal to the group number.
• In a period, elements gradually change from metallic to non-metallic character.