Mendeleev's periodic law: It states, "All the physical and chemical properties of the elements are the periodic function of their increasing atomic weight".
Fig: Dimitri Mendeleev
Atomic weight: It is the sum of number of protons and neutrons present in the nucleus of an atom.
Mendeleev's periodic table:
Mendeleev's periodic table
Modern periodic table
i. Elements are arranged in order of increasing atomic mass.
ii. There are nine vertical columns called groups.
iii. Transition elements are arbitrarily placed together in group VIII.
iv. There are some gaps for undiscovered elements.
v. There is not proper place for the inert gases.
i. Elements are arranged in order of increasing atomic number.
ii. There are eighteen vertical columns called groups.
iii. Transition elements are placed in the middle of long periods.
iv. There are no any gaps for the new elements.
v. The inert gases are arranged in zero group, extremely in left side of the periodic table.
The following are the characteristics of Mendeleev's periodic table:
Mendeleev left some gaps in his original periodic table for the undiscovered elements like titanium, gallium, scandium and germanium. When these elements were discovered later on, they were placed in those gaps, without disturbing the existing arrangement of elements.
The Mendeleev's periodic law states that, “The physical and chemical properties of elements are periodic function of their atomic weights.
The drawbacks of Mendeleev's periodic table are:
The anomalies of Mendeleev's periodic table are:
because it is resemble with both Group IA and VIIA of periodic table.
The sum of number of protons and neutrons present in the nucleus of an atom is called ______.
none of above
The law, 'all the physical and chemical properties of elemnts are periodic function of their atomic weight' is given by ______.
none of above
The vertical rows in a periodic table are called ______.
The physical and the chemical properties of elements are the periodic functions of their atomic weights is ________________________.