why to classify elements
Answers
The number of elements discovered has increased, making it difficult to remember the behavior and properties of these elements. Hence it is important to classify elements according to their properties. ... To compare the properties of elements. It helps us understand how different elements form different compounds
Explanation:
(a) Classification of elements helps in:
(i) Systematic study of the properties of elements.
(it) Easy to understand and remember the properties of elements.
(b) The two criteria used by Mendeleev were: (i) Increasing order of atomic mass.
(if) Similarity in the properties of the elements.
© Mendeleev left gap in his periodic table for the undiscovered elements like germanium, gallium.
(d) There was no mention of noble gases like helium, neon and argon as they were not known at that time and were discovered much later.
(e) According to Mendeleev’s periodic table Cl-35 and Cl-37 should be placed at different positions as the basis of classification is increasing order of atomic masses but since their chemical properties are same they should be placed in the same position in the periodic table