Classification of Elements

Things to remember

• Classification of elements: The main utility of the system is that it affords a scheme of classification of elements, which is helpful in the study of 109 elements is reduced to nine groups only.
• Mandeleev's periodic table was based on atomic mass. In 1913, Mosley from his studies on x- rays found that the atomic number is the more fundamental property of an element than its atomic mass. Thus, atomic number was adopted as the basis of modern periodic table.
• Modern periodic law: The properties of elements are a periodic function of their atomic numbers.