Question

What are the characteristics of Mendeleev's periodic table?

Answer 1

Mendeleev's periodic table:

• Mendeleev states that “The properties of the elements are a periodic function of their atomic weights.”

Characteristics of Mendeleev's periodic table:

• The vertical columns in a periodic table were classified as groups while the horizontal rows are named as periods.
• The periodic table is composed of $7$ periods that are numbered between $1\mathrm{to}7$and $8$ groups, numbered between $1\mathrm{to}8$.
• Transition elements are placed in Group VIII while all the normal elements are placed between Groups I to VII.
• Periods from $4^{\mathrm{th}}\mathrm{to}{7}^{\mathrm{th}}$ have been divided into two series: $1^{\mathrm{st}}$ series and $2^{\mathrm{nd}}$ series.
• Elements having similar properties have been kept in the same group. For example; Lithium, Potassium, Rubidium, etc. are in 1st group.