Why was the system of classification of elements into triads not found suitable? It is because all the elements discovered at that time could not be classified into triads. What is the total number of period in periodic table? There are seven periods in modern periodic table.
According to which periodic table, every eight element repeat etxra property? Newlands Octave. Why Doberiner triad theory failed? Only three triads were discovered.
Which element was named as Eka�aluminium earlier? How does the electronic configuration of an atom of an element relate to its position in the modern periodic table? Explain with one example. The position of elements 1 upon number of valence electrons which depend upon electronic configuration. Those elements which have same valence electrons, occupy same group. Those elements which have one valence electron belong to group 1.
Elements which have two valence electrons belong to group 2. Period number is equal to the number of shells. Example : Atomic number of sodium Na is 11, so electronic configuration will be 2, 8, 1.
Sodium has one valence electron in valence shell so it belongs to group 1. As sodium has three shells, so it mths to 3rd period. Wrtie two achievements of Mendeleev periodic Table? Two achievements are. For example cobalt was put before Nickel. State the modern periodic law for classification questione elements.
How many a qjestions and b periods are there in the modern periodic table? Class 10 maths ch 5 extra questions validity an account of the process adopted Ch 3 Maths Class 10 Extra Questions Words by Mendeleev for the classification of elements.
Elements having extr properties were placed in the same class 10 maths ch 5 extra questions validity. Elements were automatically arranged in increasing order of their atomic masses except few discrepancies were. Which is the more fundamental property of elements that is used in the development of Modern Periodic Table? On which side of the periodic table one can find metals, non-metals and metalloids?
Properties of the elements are a periodic function of questiins atomic numbers. What are metalloids? In periodic table, they act as border between metals and non-metals. How does the electronic configuration of an atom relates to its position period and group in the modern periodic table? Justify your answer. If an element has only one shell in its electron configuration, it is placed Ch 8 Maths Class 10 Extra Questions Result in the first period. If the element has two shells then it is placed in the second period.
Vertical columns in the class 10 maths ch 5 extra questions validity table are called groups. There are eighteen groups and in a validiyy all the elements have same number of valence electrons. Questoins modern periodic table is based on atomic number, not on atomic mass.
Since, both Cl and Cl have same atomic number, hence they are placed in same slot. Notes of Chapter 5 Periodic Classification of Elements. Previous Post Next Post. Contact form.
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